Twelve traits that long-married couples and relationship researchers consistently identify as predictive of durable partnership. Not a checklist for finding someone; a recognition list for knowing what you already have.

1. He shows up — reliably, in small ways. Consistency beats grand gestures for long-term trust.
2. He listens to understand, not to reply. Genuine listening is rarer than it looks; notice it.
3. He handles his own emotions. Not avoidant, not dumping — processing them like an adult.
4. He's kind to people who can't do anything for him. Waiters, junior colleagues, strangers. How he treats them is who he actually is.
5. He accepts your influence on decisions. Gottman's research: this one predicts marital success strongly.
6. He keeps his word, even inconvenient ones.
7. He grows — visibly, year over year. Not the same person at 40 as 30 as 50.
8. He supports your career and interests as if they were his own. Not begrudgingly; with genuine investment.
9. He fights fair. No contempt, no stonewalling, no scorecard.
10. He protects you without making you feel small. Strength used in your service, not over you.
11. He's your calm place. Not constant; trustable under pressure.
12. He makes you want to be better, not because you're not enough, but because he sees more in you than you see.

Twelve qualities. The keeper recognises them in his behaviour over time — not his words at dinner, not his promises during hard moments, but his pattern across months. Watch the pattern.