Couples Build Compatibility Through Private Rituals, Not Matching Traits
Social psychologist Eli J. Finkel argues that lasting compatibility is less about finding someone who matches a list of preferred traits than about building a shared world through private phrases, rituals and repeated moments. That world, which he calls a couple’s love motif, can make commitment feel like an expression of individual authenticity rather than a compromise of it.
Compatibility is built, not found
Eli Finkel begins with a scene from Ghost: a dead man needs to convince his wife that a message comes from him. “Tell her I love her” is too generic. The word that works is “Ditto”—their private code for the same feeling, meaningful because it belongs to the world they built together.
Finkel calls that world a relationship’s “love motif”: a recurring set of shared experiences and meanings that uniquely identifies a couple. It can include private phrases, odd jokes, rituals and a distinctive moral code. What looks trivial from outside can help define a relationship from within.
That matters because long-term partners can experience a conflict between being true to themselves and being true to their relationship. Finkel says people increasingly feel responsible for being authentic, and may feel ashamed to stay in a relationship that seems to compromise who they are. But this assumes that individual authenticity and commitment must compete.
The familiar picture of compatibility reinforces that assumption. We imagine ourselves as a collection of attributes—personality, habits, preferences—and search for someone whose attributes fit. Finkel and his colleague Paul Eastwick have studied the question across tens of thousands of couples. In speed-dating studies, researchers asked people what they wanted in a partner, then introduced them to potential partners who varied in traits such as attractiveness, humor and kindness. People who said they cared especially about a trait were not more attracted to partners who had more of it. Finkel says stated preferences cease to matter once people meet a live partner. The same is true of similarity: people are not especially compatible simply because they resemble each other.
Rather than finding a person who fits a checklist, Finkel says, partners build compatibility through small interactions: a phrase repeated, a joke that sticks, a ritual that takes shape. Two people create a shared world that did not exist before.
A shared world can make commitment feel authentic
Finkel’s example from his own marriage began in its early months. “Belly full of wine,” a line from a Beatles song, became his and Allison’s way of expressing love or gratitude. Repeated and adapted over time, the phrase became part of their shared identity.
When a relationship becomes part of who someone is, Finkel argues, loyalty to it need not mean abandoning the self. It can be an expression of authenticity. That reframes the choice in La La Land: when Emma Stone’s character gets an opportunity overseas, Ryan Gosling’s character encourages her to pursue it while staying behind to follow his own plan. In Finkel’s reading, each treats the other’s individual path as decisive, leaving the relationship itself without a voice. Protecting their private world, he says, would not necessarily have betrayed authenticity; it might have expressed it.
500 Days of Summer shows a different cost of losing that world. A couple invent a playful domestic-life ritual among IKEA displays. Later, when he tries to revive it, she does not join in. The sting, Finkel says, is not just a rejected joke: the private world it represented is gone.
Small rituals can matter more than they look
In a study, couples described their own love motifs: an October-long horror-movie calendar, a special song sung to a baby daughter every Shabbat, and “surfing on a shrimp sandwich.” Finkel and colleague Lydia Emery tracked the couples daily for weeks. Finkel said the researchers were still finalizing the article, but reported that couples who leaned more strongly into their love motif were happier—and that each couple was happier on days when they leaned into it more.
Finkel’s point is not simply to schedule date nights. It is to savor the couple’s particular shared world. His wife once left him a Post-it note reading “Belly Full of Wine!! Have a great day teaching.” A decade later, he still keeps it in his cabinet; it moved with him when he changed offices. To anyone else, the note might be unremarkable. To him, it carries their shared meaning.
Some parts of a relationship change over time: novelty, excitement and passion may fade. Finkel says something deeper can grow: a shared history and a private world that may mean little to others and a great deal to the couple.
Find it, feed it and fight for it
Finkel’s practical advice is to find, feed and fight for a couple’s love motif. Find it by noticing moments when something uniquely “us” begins to emerge. Feed it by returning to those moments and nurturing them into rituals or inside jokes. Fight for it against distraction, drift and the belief that small things cannot matter.
A phrase, a song or a note can become a symbol of that private realm. Finkel’s closing advice is to build and protect that shared world while there is still time.