Ten relationship-maintenance practices.

1. Schedule calls with close friends (real commitment, not "soon")
2. Remember names, details, things they care about
3. Write actual letters occasionally
4. Show up for life events — weddings, funerals, birthdays
5. Follow up after their hard moments
6. Ask specific questions; listen to answers
7. Don't keep score
8. Forgive small slights quickly
9. Speak well of them in their absence
10. Make time when they ask for it — even inconvenient time