I only see them at work

I don’t lay a boundary, I just tend to be very slow to trust. I’ve made three incredibly close friends from work but I never specifically sought them out.

at the door?

I don’t have a set boundary, I just have intense social anxiety so I have difficulty actually transitioning to the friends outside of work part. 99% of the time it doesn’t happen even though I’d like it to. But I definitely have had my “at work” friends until either they or I have moved away.

Limit outside of work social interactions to going away, retirement, and holiday parties, maybe occasional mutual hobby stuff like bowling or sports; basically large group outings a-ok, 3 people gathering sparingly, 2 person stuff is a bit too intimate