I read recently that few people have more than 5 close friends. It is something to do with dynamics of how we relate to others.
I do have several friends, but no outer circle. DS and DDiL seem to know everyone and have whole circles, of very close friends, outer circle and circle beyond that, and my mother was similar, but this skill eludes me and DD who has chosen to live alone and unpartnered has a small circle of good friends and seems to have no need for an outer circle.
I have a few close friends, ones I can turn to in distress, most are long-standing. I persevere with friends and tend not to fall out with people, although one close friend, now dead, did push my tolerance to limits I did not know it could reach.