I hope he doesn't try to come back
What are you afraid will happen if he tries coming back?
Nothing, I just want him to suffer from his mistakes.
It's okay to move on from someone that has caused problems in your life. If he comes back you should probably just tell him you're not interested, and that he should stay away.
I'll just mess with his head.
It's good that you are prepared to move on, but you shouldn't be toying with others' emotions, regardless of what they have done to you.  If this other person is not yet over you, you should tell him flat out that it is over.  Otherwise it is wrong to mess with him.