I was the little group therapist for all my friends in high school, though I had a lot of strange instances like that.

One of my current best freinds was someone who I had hated/hated me/attempted to break my arm.

I had one of my best freinds conspire against me and actually threatened my life.

I drifted apart from some people.

Some of my lesser friends have 'drifted in' to become better friends

And I have some friends who I have been close with for almost all of my life.

It happens though, relationships in general are wierd. "Life is full of meetings, departings and reunions"