Bringing up an ex is supposed to be a fast way to start a fight, but a controlled study found the opposite happening in real time. Researchers Soo Yeon Park, Ye Ji Im, Hyun Moon, Sun W. Park, and Gregory D. Webster published a study in the journal Emotion that randomly assigned 172 unmarried Korean adults in current relationships to write about a nostalgic memory involving either an ex-partner, their current partner, or a neutral account of the previous week. People assigned to write about an ex-partner did not report any drop in how satisfied they felt with their current relationship afterward. If anything, both the ex-partner group and the current-partner group reported increased relationship satisfaction once the writing task was done.
The Experiment That Tested a Common Assumption
The design was deliberately built to isolate cause from correlation. Rather than simply asking people whether they think about their exes and correlating that with how happy they are, the researchers randomly assigned participants to one of the three writing conditions, then measured relationship satisfaction and commitment both before and after the exercise, along with the emotions people reported feeling during it. That structure lets researchers say something correlational surveys can’t: that thinking about an ex-partner’s nostalgic memory appears to actively cause a satisfaction bump immediately afterward, rather than merely being something that happier people are more inclined to do anyway.
Why Relationship Length Changes the Story
The finding wasn’t identical across every relationship. Relationship duration moderated how the current-partner nostalgia condition affected commitment specifically: in newer relationships, writing nostalgically about the current partner actually decreased reported commitment, a counterintuitive wrinkle the researchers highlighted as one of the study’s more surprising results. One plausible read is that newer couples don’t yet have enough shared history to make a nostalgia exercise feel authentic, so being asked to manufacture warm nostalgic feelings about a partner they haven’t known very long backfires slightly. Longer-established couples, with a genuine backlog of shared memories to draw from, didn’t show that same dip.
Nostalgia Does Something Satisfaction-Boosting on Its Own
What both nostalgia conditions had in common, regardless of whether the memory involved an ex or a current partner, was that they outperformed the neutral, non-nostalgic writing task on relationship satisfaction. That points toward nostalgia itself, as an emotional state, being the active ingredient rather than the specific person the memory happens to be about. Nostalgic reflection tends to boost feelings of social connectedness, meaning in life, and self-continuity more broadly, according to a foundational review of nostalgia research by psychologists Constantine Sedikides and colleagues, and this newer study suggests those broader benefits can spill over into how satisfied someone feels with the relationship they’re currently in, even when the memory being recalled doesn’t involve that partner at all. A summary of the Emotion study by PsyPost noted that participants in both nostalgia conditions reported the exercise itself felt emotionally warm rather than distressing, which lines up with how nostalgia researchers generally describe the emotion: bittersweet, but tilted toward the sweet.
A Related Study Found Something Similar
This isn’t the only research pointing in this direction. A separate study published in the European Journal of Social Psychology, titled “Dear Old Love,” examined how reflecting on nostalgic memories about ex-partners affected people’s current romantic relationships and likewise found that the exercise didn’t automatically damage how participants felt about their current partner. Taken together with the Emotion study’s randomized design, the pattern looks less like a fluke of one particular sample and more like a genuine, replicable feature of how nostalgia interacts with present-day relationship satisfaction, regardless of which specific partner the memory happens to be about.
What This Actually Means for Couples
None of this is a license to dwell on an ex at a current partner’s expense, and the study doesn’t say anything about how a current partner feels upon learning that kind of reminiscing happened. But it does undercut the reflexive assumption that any mention of an ex is automatically corrosive to a relationship. The emotional mechanism at work here looks less like betrayal and more like ordinary nostalgic reflection doing what nostalgic reflection tends to do: making the person feeling it, at least temporarily, feel more connected and more content, wherever that feeling happens to land once the memory fades. A relationship secure enough to withstand an occasional mention of the past may be sturdier, not more fragile, for it.
