I lost most of my high school friends pretty quickly once gone to college but have managed to keep 2 good ones into my 30s, messaging or having a phone catch up

I lost most of my high school friends pretty quickly once gone to college but have managed to keep 2 good ones into my 30s, messaging or having a phone catch up with each anywhere from 1 to 5 times a year. In college the social life was pretty accessible through clubs, fraternities, study groups or dorm common rooms. My most steadfast friends have been from high school and from startups after college. They say "shared struggle breeds friendships" or something like that. Though in my generation ghosting was considered much more rude (or at least seemed less common), you at least had to try to politely deflect a message or phone call.