Having a doorman sounds arcane to me. Don't you just beep your key to get in? Why should I pay for someone sitting there all day watching the entrance? Will they stop my brother from coming in and watering my plants while I'm on vacation?
Unreal. When I lived in apartments I always made sure no one followed me in unless I recognized them and knew they were my neighbor or a neighbors guest I saw frequently.
When your neighbor broke up with their boyfriend, did they notify everyone in the building to no longer let him follow them in like you seem to be ok with doing? Or did you just assume it was fine and let him in since you saw him come in with them before?
I think I'm probably more socially awkward than you but maybe just in a different way. :)