I don't like some of my friends even though they still like me.
Why don't you like those friends?
We haven't really been friends in a while.
If you don't like some of your oldest friends, then it would be better to find new ones. When you get older it's natural to make new friends. Sometimes people grow apart or lose interest in the same things, which in normal.
I'm going to try to hurt them.
It's okay to move on from friends if you never see them anymore. It's not okay to be mean or try to hurt them. You should just make new friends that you have more in common with instead.