Dating profiles are full of shared interests: hiking, cooking, live music, trying new restaurants. These things feel like compatibility clues. They're not. Or rather, they're weak ones — much weaker than we tend to assume, and much weaker than a different category of similarity that most dating profiles don't measure at all.
The research on long-term relationship satisfaction consistently shows that shared interests predict whether people will have things to do together on weekends. Shared values predict whether they'll be able to navigate disagreement, make major life decisions, and build a life that actually makes sense to both of them.
These are not the same thing. And in the long run, one matters far more than the other.
What values actually means here
Values, in the relationship context, is not a soft or abstract concept. It refers to foundational priorities and beliefs that shape how people live, what they consider important, and what they're working toward. Think of them as the operating system rather than the applications.
Values include things like: how important family is relative to work, whether financial security is prioritised over experience, attitudes toward honesty and loyalty, how much independence versus interdependence matters in a relationship, what constitutes a meaningful life, whether having children is essential or optional, and beliefs about fairness and reciprocity.
Two people can both love hiking, prefer the same kind of restaurants, and have an identical taste in films — and still fundamentally disagree about all of these things. The hiking compatibility will make for pleasant early dates. The values incompatibility will cause serious problems later.
What the compatibility research shows
"Initial attraction is only weakly associated with relationship success. What predicts whether people will still be satisfied five years in is a different set of factors entirely — and most of them are invisible on a first date."
— Paul Eastwick & Lucy Hunt, Relational Mate Value: Consensus and UniquenessEastwick and Hunt's research on mate value and compatibility found that the qualities people found attractive in initial assessments — physical appearance, charm, confident presentation — had weak or zero correlation with relationship satisfaction over time. By contrast, qualities that could only be assessed over repeated interaction — emotional availability, reliability, integrity, how someone handled disagreement — showed much stronger associations with long-term outcomes.
LoveCertain's compatibility model is built on this research: four dimensions weighted by how strongly each predicts long-term satisfaction:
Values
Foundational beliefs and priorities — what matters most, how to live, what kind of life to build. The highest-weighted dimension because values differences tend to compound over time and become harder to navigate, not easier. Agreement on values doesn't mean agreeing on everything. It means the fundamental orientation to life is compatible.
Life stage
Alignment on timeline and direction — whether you want children, when, where you want to live, where you are in your career, what the next five to ten years look like. Life stage mismatches are often dismissed early on because they feel abstract. They stop feeling abstract quickly.
Attachment style
How you relate to closeness, distance, security, and conflict — shaped by early caregiving experiences. Attachment style shapes the entire texture of how a relationship feels, including whether intimacy feels safe or threatening, how conflict is navigated, and what a partner's independence means to you.
Communication
How people express needs, handle disagreement, and repair after conflict. Communication is partially a skill that can be developed, but style and capacity for conflict tolerance are also dispositional — and compatibility here makes everything else easier.
If you found this useful
Matched on what actually predicts success
LoveCertain matches on values, life stage, attachment style, and communication — not just photos. £49 once. Full refund in 90 days if no relationship.
When values mismatches surface
Values differences often don't surface immediately. Early relationships operate on goodwill, novelty, and the softening effect of attraction, which can make significant differences feel negotiable or irrelevant. They rarely are, long-term.
Major decisions reveal values, not just preferences
Decisions about where to live, whether to have children, how to spend money, how much time to spend with families of origin, how to balance career ambitions — these are all downstream of values. Two people with different values can often agree on individual decisions. But over dozens of decisions across years, the underlying values shape a life. And a life built primarily on compromise rather than shared direction tends to become increasingly difficult.
Disagreement about what matters is harder than disagreement about facts
Couples can usually negotiate differences in taste, habit, and preference. It's much harder to negotiate a fundamental difference in priority. If one person values financial security highly and the other prioritises experience and freedom, this is not a preference difference that good communication can easily bridge. It's a values difference, and it will recur across every major financial decision indefinitely.
Values mismatches tend to compound
In the early phase of a relationship, values differences are often tolerable because they don't yet require resolution. As the relationship progresses — with the accumulation of decisions, commitments, and life changes — the same values differences become increasingly load-bearing. What felt like an interesting difference at six months often becomes a source of chronic friction at three years.
How to actually assess values compatibility
Go beyond the surface questions
Asking "what are your values?" rarely produces useful answers — the question is too abstract and most people give aspirational rather than actual responses. More informative questions are specific and situational: "What would you be unwilling to compromise on in your life?" "If we disagreed about a major financial decision, how do you imagine that going?" "Is family involvement something you actively want, or something you accommodate?" The answers reveal operating values, not professed ones.
Watch how they actually live, not what they say they value
Stated values and lived values are often quite different. Someone who says family is important but has been consistently absent from their family's significant events for years is showing you their actual priorities. Someone who values honesty but readily tells small lies to avoid discomfort is showing you the limits of that value under pressure. What people do consistently, especially when it costs them something, tells you more about their values than what they say about them.
Have the important conversations earlier than feels comfortable
Questions about whether you want children, where you want to live, what you want your life to look like in a decade — these feel serious for early dating, which is why many people avoid them. But avoiding them doesn't make the incompatibilities go away; it just means discovering them later, when more is invested. The conversations can be light and curious rather than pressured. "Have you thought about what the next few years look like for you?" is a genuine question, not an interrogation.
Some values are non-negotiable; others have more flexibility
Not every value needs to be perfectly aligned. Some values are foundational — about children, religious practice, how to handle money, what kind of life to live — and genuine incompatibility here is usually a dealbreaker regardless of attraction. Others are more flexible — attitudes to tidiness, social preferences, how much alone time is needed — and can be navigated successfully with goodwill and communication. Good communication doesn't resolve values incompatibility, but it does help partners navigate the areas of difference that are manageable.
The Certain Letter
Weekly insights. No filler.
Shared interests, in their proper place
None of this means shared interests don't matter. They contribute to the texture of a relationship — what you do together, how you spend time, whether you have fun. Couples with more overlapping interests tend to have more natural points of connection, more shared experiences to draw from, more easy days.
But interests are easy to develop and easy to accommodate. You can learn to enjoy something your partner loves. You can happily spend time apart doing different things. The interest gap, with goodwill, is usually bridgeable.
The values gap is harder. When two people fundamentally want different things from life, or operate from different priorities about what matters, no amount of shared love for the same hiking trails changes the underlying incompatibility. The research on what makes relationships last is consistent on this: the foundations matter more than the furnishings, and values are as foundational as it gets.
Related: intimacy: what it is (and how to build more of it).
Matched on what actually matters
Values, life stage, attachment style, and communication — weighted by relationship science. One payment of £49. No subscription tricks.
Join LoveCertain — £49
