The question of why marriages fail has occupied psychologists, sociologists, theologians, and divorce lawyers for as long as marriage has existed as a legal and social institution. What the research over the past half-century suggests is that the reasons are more predictable — and more preventable — than most people realize when they are in the middle of a failing relationship.

Psychologist John Gottman, whose longitudinal research on married couples has become foundational in relationship science, identified what he called the "Four Horsemen" — communication patterns that predict divorce with unusual accuracy: contempt (treating a partner as inferior or beneath consideration), criticism (attacking character rather than behavior), defensiveness (refusing to accept responsibility), and stonewalling (emotional withdrawal from conflict).

Of these, Gottman found contempt to be the single most corrosive — and the most predictive of eventual dissolution. Contempt communicates a fundamental disrespect that erodes the emotional safety on which intimate partnership depends.

But the mechanics of communication are downstream of something more fundamental: whether two people share compatible values and life visions, and whether they have made those values and visions explicit rather than assumed. Many marriages fail not because the people involved don't love each other but because they have fundamentally different ideas about how life should be lived — ideas they never fully articulated or examined before committing.

Research on the timing of marriages finds that couples who marry very young, who have not developed stable individual identities, or who are marrying to escape unhappy circumstances rather than toward a positive future together, divorce at significantly higher rates.

The uncomfortable implication is that many divorces are predictable from the wedding day — which suggests that what is most needed is not better divorce law or better couples therapy, but better preparation before commitment.