Loosing all those flaky friends is still miserable, you can't help to feel ripped off. I was always there for them always through thick and thin and they just weren't the same .
I went through a morning period it was like a death of them not of me! It was the beginning of a life for me. Still can't believe how many just never gave a damn. What I learned was that many were afraid and intimidated that I left and I understand that.
Friendship not based on performance is way way better and more fun! I really enjoy my friendships now they are way more relaxed and meaningful. I love being in control of deciding who will be a close friend instead of being forced to hang with people you really don't connect with but are just forced to like before.