People are complex.
I had people that I thought of as friends who let me down. When I had anxiety so badly that I was unable to leave the house: not 1 phone call to see how DH was coping, no letters, visits .......... I cut our C.mas card list in half
I also realised that peoples' needs alter. I also removed myself from those that drained me. I too would give time and energy and listen to people with 'problems'. We all like a good moan I think but these situations became 1 sided. When I needed support it wasn't there. I remember going to a friend stating "I'm in a bit of a muddle and would like a cup of tea": "Your'e in a muddle, how do you think I feel X, Y, Z". That was over 40 years ago and to this day she has never enquired about my muddle! We speak when we meet but that's all. I stopped trusting after that.
I too keep my sibling at arms' length, we live in different countries so don't have to meet except for Funerals. We exchange texts and letters occasionally.
DH is my closest friend and alley ? sp ? - still haven't worked out why