Its hard to find good friends. I have always had an effective antenna for them and ended up with a very small number of good friends.
In contrast, my best friend is a strong extrovert who knows people everywhere. He thought he had lots of friends. But when the brown stuff hit the fan he found those friends in general to be quite disappointing.

If it is any consolation I can guarantee you that there are people out there who will stay by your side and will not walk out on you. But you have to approach every new person as if you expect them to be true. Keep your own mind and heart open, despite your bad experiences in the past.