I constantly leave my friends
Do you think there is a reason in particular why you tend to leave your friends.
They just always seem to leave me disappointed.
It sounds like your friends frustrate you, but it's wrong to leave them behind. You should discuss your feelings with them and see if you can work out your differences. Saving your relationship with your friends is very important.
I feel the need to betray them. I don't want to be friends with them anymore.
If you are always feeling disappointed with your friends than it could mean that you should find news friends. It sounds like you are both doing mean things to one another, so maybe talking things out can help you both begin being more nice to one another.