How do you say "no" or "please don't talk to me, you were a terrible boyfriend" in a nice way?

You can always say, "Maybe I have changed and things have just changed. I'm sorry, but I can't see us as being like we were before and now I need space."

Just tell him please don't touch me or say that u didn't like what he was doing, if it don't work Just tell him you really hated him doing that and that he should not do it....

tell him you can't see it working out between you, but only be honest about your feelings towards him if he asks why/why not & also don't forget to let him know that its still ok/you'd really like to be friends. Let him know that you can't always hang out with him or be at all/every single one of his performances because you have other commitments & your other friends which you'd like to spend time with as well. If he keeps molesting/annoying you, then remind him that your just friends & if he still doesn't stop, tell a teacher/parent or another trusted adult about it before it goes to far. Good luck & hope it all works out well :)!!