Feeling nostalgic about a former partner is widely seen as a potential danger sign for a current relationship. New research from South Korea instead suggests that reminiscing about an ex can actually increase how satisfied people feel with their present romantic partner, at least in the short term.
The study, titled Revisiting Nostalgia for Current and Ex-Romantic Partners: Affective Profiles and the Moderating Effect of Relationship Duration, adds nuance to how psychologists view longing for past love. Rather than serving as a simple red flag, nostalgia emerges here as a complex emotional process that can, under some conditions, subtly strengthen the bonds people share today.
Published in Emotion, the study examined how two forms of relationship nostalgia affect current couples. Romantic nostalgia focuses on memories involving a current partner, while ex-partner nostalgia centers on a previous relationship. Both involve sentimental longing for meaningful shared experiences.
Previous research, conducted largely in Western countries, has found that romantic nostalgia can deepen feelings of closeness and relationship satisfaction. The effects of ex-partner nostalgia have been less clear, with earlier findings pointing to both potential drawbacks and benefits. The new study examined these effects in an Eastern cultural context.
Cultural context and expectations
Lead author Soo Yeon Park, now at the University of Florida, and colleagues focused on unmarried adults in South Korea. In many Eastern cultures, identity can be strongly connected to social harmony and stable relationships rather than solely to fixed individual characteristics. The researchers expected that revisiting a failed past romance might disrupt this sense of continuity.
They hypothesized that ex-partner nostalgia would reduce satisfaction with a current relationship and threaten feelings of security. The researchers also tested whether the duration of a participant’s current relationship influenced how nostalgia affected both satisfaction and commitment to the relationship’s future.
To participate, individuals had to be currently dating and have experienced at least one previous relationship lasting three months or longer. This ensured that memories of former partners involved relatively substantial past relationships rather than brief encounters.
How the experiment was designed
The researchers recruited 172 unmarried Korean adults who were currently in romantic relationships. At the beginning of the experiment, participants reported their baseline levels of relationship satisfaction and commitment, two related but distinct aspects of relationship health.
Satisfaction reflected how content participants felt with their current partners, while commitment captured longer-term intentions, including their desire to remain together and continue investing in the relationship.
Participants were randomly assigned to one of three writing exercises. One group described a highly nostalgic memory involving an important ex-partner. Another wrote about a nostalgic experience involving their current partner. The control group described their activities during the previous week in a neutral, factual manner.
After completing the exercise, participants again rated their relationship satisfaction and commitment. They also reported the emotions they experienced while writing, allowing researchers to compare the emotional profiles associated with each type of nostalgia.
Surprising boost from ex-partner nostalgia
The results contradicted the researchers’ original expectations. Rather than undermining participants’ current relationships, ex-partner nostalgia increased relationship satisfaction. Those who wrote nostalgic accounts involving a former partner reported greater satisfaction with their current partner immediately afterward.
A similar increase occurred among participants who recalled nostalgic experiences with their current partner. The control group, which simply described the previous week, showed no meaningful change in relationship satisfaction.
The findings challenge the assumption that thinking fondly about an ex necessarily harms a current relationship. In this experiment, nostalgia involving either a former or current partner was followed by greater immediate satisfaction with participants’ existing relationships.
Relationship length changes commitment
The results were more complicated for relationship commitment. The effect of nostalgia on participants’ intentions to remain in their relationships differed depending on how long they had been dating their current partner.
Among people in relatively new relationships, recalling nostalgic memories involving their current partner was associated with lower commitment. This pattern was not observed among participants in longer relationships, where commitment was more firmly established.
The researchers suggest that during the early stages of dating, an idealized positive memory could highlight uncertainty about the relationship’s future. In a more established relationship, similar memories may instead form part of an already developed shared history.
Emotional patterns of nostalgia
The writing exercises also revealed differences in participants’ emotional responses. Those who wrote about their current partner experienced more mixed and negative emotions than participants who focused on an ex, despite both exercises being designed to evoke nostalgic memories.
Participants recalling their current partners reported less purely positive emotion overall. The researchers discussed this finding in relation to emotion appraisal theory, which emphasizes that emotional responses depend partly on how people interpret an experience.
Revisiting a cherished experience with a current partner may highlight a moment that feels difficult to fully recreate. Comparing that memory with the present could introduce sadness or frustration alongside positive feelings, making the nostalgia more bittersweet.
Cultural context may also contribute to these emotional patterns. In collectivist societies, memories of positive experiences can involve awareness of broader relationships, obligations and social circumstances, potentially producing a mixture of positive and negative emotions.
Limits and questions for future research
The findings are limited to unmarried dating adults in South Korea and a single controlled writing exercise. Married couples, who may share legal, financial and family responsibilities as well as longer relationship histories, could respond differently to nostalgia involving either former or current partners.
Nostalgia in everyday life also often occurs spontaneously rather than through a deliberate writing exercise. Songs, places, anniversaries and changes in mood can trigger memories unexpectedly, and naturally occurring nostalgia may differ from memories deliberately selected in an experimental setting.
The researchers also lacked sufficient data to determine whether the amount of time since a breakup influenced responses to ex-partner nostalgia. Memories of a recent relationship could carry different emotions from recollections of a relationship that ended many years earlier.
Future studies could follow couples over time and use daily diaries to examine spontaneous nostalgic thoughts and their relationship consequences. Researchers could also investigate whether characteristics such as attachment style influence how people respond to memories involving current and former partners.
Overall, the findings suggest that nostalgia for an ex is not necessarily associated with immediate dissatisfaction in a current relationship. In this study, both ex-partner and current-partner nostalgia increased short-term relationship satisfaction, while their effects on commitment were more dependent on relationship duration and the context in which the memories occurred.
