What Is the Honeymoon Phase

By Blubee Editorial, Editorial team · Updated August 10, 2026

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The honeymoon phase is the opening stretch of a romantic relationship, when attraction is intense, the other person occupies most of your attention, and their flaws register as charming. It is a measurable biological state, not a mood. In one study, plasma nerve growth factor averaged 227 pg/ml in people newly in love against 123 pg/ml in long-term partners.

This page covers what the term means, how long research says the phase lasts, what changes in the brain, six signs it is ending, how it differs from what replaces it, and when the fading points at something other than time.

What the honeymoon phase means#

The honeymoon phase is a popular name for early-stage romantic love: a period of heightened attraction, idealization, and preoccupation that opens many relationships. Research does not use the phrase. Its closest construct is passionate love, described by Berscheid and Hatfield in 1969 as a state of intense longing for union with another.

That definition carries an ingredient the popular version drops: obsession. The Passionate Love Scale, the standard measure since 1986, contains items about finding it hard to concentrate at work because thoughts of the partner keep arriving. Intrusive thinking is part of the construct, not a malfunction inside it.

The word is older than the psychology. It named the first month after a wedding, and “the honeymoon is over” spread from marriages to new jobs and governments. The same words also describe the calm interval in a cycle of abuse — a different subject, not this one.

The textbook model of what comes next was set out by Hatfield and Walster in 1978: a linear passage from passionate love into companionate love, meaning warmth and a shared life with the intensity gone. That model is why the end sounds like a loss. It is also the part later evidence has not supported.

How long the honeymoon phase lasts#

No study has measured how long the honeymoon phase lasts. Research has measured when the biological signature of early-stage love stops being detectable, and those readings land between one and two years — because that is the window the studies chose for re-testing.

Emanuele and colleagues measured plasma nerve growth factor in 58 people who had recently fallen in love: a mean of 227 pg/ml, against 123 pg/ml in long-term partners and 149 pg/ml in people with no relationship. Thirty-nine were re-assessed 12 to 24 months later, still with the same partner but no longer in the state they described at intake. Their levels matched both control groups.

The hormone data behave the same way. Marazziti and Canale compared 24 people who had fallen in love within the previous six months with 24 who were single or long-partnered. Cortisol was higher in the newly in love, testosterone higher in the women and lower in the men. Every difference was gone at the 12-to-24-month re-test.

Both designs share a limitation that articles quoting these numbers skip. Neither followed anyone month by month: each took one baseline and one follow-up more than a year later. The data can say the state had ended by then, and nothing about when. The repeated “12 to 18 months” is a re-test interval retold as a deadline.

The number people quote for the honeymoon phase is the gap between two blood draws, not a measured endpoint. No published study has watched the transition happen.

The long-run picture is slower than a cliff at eighteen months. A 2021 meta-analysis by Bühler, Krauss and Orth pooled 165 samples and 165,039 participants in relationships of three months to 46 years. Satisfaction fell across the first ten years, bottomed at year ten, rose until year twenty, then slipped slightly again — never below 77% of maximum.

What happens in the brain during the honeymoon phase#

Early-stage romantic love runs on the brain’s reward circuitry, and the measurable changes sit closer to an obsessive state than to an emotion.

In 1999 Marazziti and colleagues compared 20 people who had fallen in love within the previous six months, 20 unmedicated patients with obsessive-compulsive disorder, and 20 controls. They measured platelet serotonin transporter density, a peripheral marker of serotonin function. It was significantly lower in the newly in love than in controls, and the in-love group was indistinguishable from the OCD patients.

Serotonin transporter density: 20 people newly in love, not different from 20 patients with obsessive-compulsive disorder. Both significantly lower than 20 controls (Marazziti et al., 1999).

That result explains the part people find hardest to describe: the thinking is not chosen. It is also why intensity is a poor guide to the match — the mechanism reports novelty and uncertainty, not compatibility.

The growth-factor data point the same way: nerve growth factor tracked how strongly people scored on the Passionate Love Scale, r = 0.34 (p = 0.007). Raised cortisol in the Marazziti and Canale sample supplies the other half — real stress load alongside the euphoria.

What does not switch off is the reward response. Acevedo, Aron, Fisher and Brown scanned 17 people married an average of 21.4 years, screened for still reporting intense love, while they viewed images of their spouse; the ventral tegmental area activated — the dopamine-rich region that lights up in early-stage love. Selecting the sample on that feeling means the finding shows the response can persist, not how often it does. The obsession fades; the reward value of the person can stay.

If the same drop keeps arriving at the same point with different partners, the variable is usually not the partner. See how you respond when closeness settles — 12 questions, 5 minutes, free, no email. The result places your answers on two scales, anxiety and avoidance, and shows the quadrant they fall in; it does not hand you a type.

6 signs the honeymoon phase is ending#

The signs below describe a transition, not a decline, and most people notice them in retrospect. Any one can appear in a single week for unrelated reasons. They mean something as a set, held steady across a month or two.

1. The intrusive thinking quiets down#

Preoccupation is the first thing to go, and its departure is often mistaken for lost interest. During the early phase, thoughts of the partner arrive uninvited during work and during other conversations. When that stops, the silence reads as indifference by contrast with how loud the previous months were. What changed is a marker that returned to baseline in every study that measured it. Attention is still there; it is no longer involuntary. The useful question is not whether you think about them constantly, but whether you still want to tell them things.

2. Small habits become visible#

Idealization is expensive to maintain, and it ends before affection does. In the early phase, details get filtered: the interrupting, the loading of the dishwasher, the way stories get told twice. Later the same details arrive unfiltered and feel like new information about the person, though nothing has changed except the filter. This is the sign most likely to be misread as a warning. It is worth separating traits that are merely visible from the ones that are actually costly. Almost everything on the first list was there in month two, unnoticed.

3. The first real disagreement arrives#

Conflict gets postponed during the early phase rather than avoided by temperament. Both people are managing an impression, the stakes feel unbearably high, and small mismatches get absorbed instead of raised. When the intensity settles, the backlog surfaces, often over something trivially small relative to the reaction it produces. A first serious disagreement several months in is not evidence that the relationship was fake or the fit wrong. It is usually the first time either person felt secure enough to risk one. How it gets handled matters far more than that it happened.

4. Time apart stops feeling like a countdown#

Separation is where the change is easiest to measure, because the early phase makes ordinary distance feel physically uncomfortable. A weekend apart no longer registers as an ordeal, and unanswered messages stop generating a narrative. For some people this arrives as relief. For others it is the most alarming sign here, because the discomfort had been serving as proof that the relationship mattered. If quiet reliably converts into threat for you, that reaction is worth examining on its own — it is closer to reading quiet as distance than to anything the other person did.

5. Sex becomes something you schedule#

Frequency in the early phase is driven partly by novelty, and novelty is not renewable at that rate. What follows is not an absence of desire but a change in what starts it: intention rather than urgency. Couples reporting intense love after ten or more years of marriage also report affection and ongoing sexual intercourse among its correlates, so this is not a stage where sex is supposed to disappear. It is a stage where it stops happening by accident. Treating that as a scheduling problem rather than a feelings problem solves it more often.

6. Your own life comes back into focus#

Absorption is temporary, and its ending looks like withdrawal from the outside. Friendships that went quiet start up again, hobbies resurface, and the relationship stops being the only thing worth talking about. Both people usually reach this point at slightly different times, and the gap is where trouble starts: whoever gets there second reads the other’s returning independence as a loss of interest. If the pull runs the other way instead, toward losing the edges of yourself, then a separate life reappearing is the healthier direction and not the warning sign.

Honeymoon phase vs long-term love#

The honeymoon phase differs from what follows on one axis more than any other: obsession. In a meta-analysis of 25 studies, romantic love without obsession was strongly associated with satisfaction in both short and long-term relationships, while obsession correlated positively with it in short-term relationships and negatively in long-term ones.

The row doing the most work is the last one. The old model treated companionate love as the destination and the intensity as a fee paid on the way in; the data do not force that ending. In one data set of long-term couples, 42 of 312 partners — 13% — gave the maximum rating to every romantic-love item. In a random sample of 274 married Americans, 40% of those married over ten years called themselves very intensely in love.

What to do when the honeymoon phase ends#

The end of the honeymoon phase is a transition to manage, not a verdict. Three moves are worth more than the rest, and the first is diagnostic.

Separate what changed from what became visible#

Two different things happen at once when the phase ends, and they call for opposite responses, so the sorting has to come first. Traits that were always present and merely stopped being filtered are not new information about the relationship. Behavior that genuinely changed — attention withdrawn, effort dropped, shutting down during conflict where there used to be engagement — is new information. Write the specific complaints down and sort them into those two columns before raising any. The first column usually shrinks, and the second gets much easier to talk about.

Build novelty on purpose#

Novelty stops arriving free once a partner becomes predictable, which is exactly why it has to be scheduled. Among the correlates of intense love in couples married more than ten years were shared novel and challenging activities, thinking about the partner while apart, affection, and general life happiness. None of those is exotic and all of them are elective, which is the useful part. The practical version is a standing commitment to do something neither of you has done before, at a frequency you will keep — monthly beats a weekly plan abandoned in March.

Watch which pattern shows up when the intensity drops#

The transition is where attachment patterns become legible, because it removes the certainty that was papering over them. One person starts seeking reassurance as the signal fades; another finds the settling a relief and begins pulling back as things settle. Neither reaction is a character flaw, and they interlock badly, which is why this stage produces so much avoidable conflict. If you recognize the loop from earlier relationships, the patterns behind the shift covers it in detail — and people whose calm reads as steady without the intensity are not immune.

When the end of the honeymoon phase is not the explanation#

The honeymoon phase ending is the wrong explanation whenever the change tracks an event rather than the calendar. Three cases get misfiled this way, and the misfiling turns a solvable problem into an inevitable one.

The first is external load. A new baby, an illness, a job loss, or a caregiving year will flatten warmth in a relationship of any age, and the timing often coincides with the first or second year by accident. The meta-analytic curve is slow; a change with a month attached is usually about the month.

The second is asymmetry. The end of the honeymoon phase happens to both people, roughly in parallel, and looks like two people relaxing. When only one person’s warmth dropped, time is not the variable. Contempt, sustained criticism, and disappearing effort belong here too — not the calm end of a phase, and describing them as one delays an overdue conversation.

The third is a connection that never had the phase to lose. Early intensity inside a connection with no label is not the opening stage of anything, because nothing was agreed to progress from. The same holds when the pull-back arrives at the same point with each new person; people who find themselves attaching fast to new people reach it earliest.

No page can tell you which of these is happening here, and the descriptions above are patterns, not judgments. If a structured starting point would help, the free self-assessments on this site cover adjacent patterns — none replaces the conversation itself.