I have always had some friends, but I have always found it very difficult to make friends. So when a friend or two naturally drifts apart, I can find that I am left with no friends or one or two. This has been an issue for me all my life.
I don't know why I find it hard. I always get told that I am pleasant and friendly. At the moment I have one good friend who I have known for years and years and see regularly, a couple of other friends that I have know for years and years but don't see very often, and a couple of people I am friendly with and socialise with and would like to be proper friends with, but they dont seem interested - so one has birthday meals etc, but never invites me.