When I caught my ex cheating on me, I beat up the man that was with her.
Really? Could you explain to me why?
He was touching her, I was jealous and didn't like it.
You have no right to physically attack someone because your feelings are hurt over being cheated on. If you continue to be violent you may end up in jail.
I will do it again if I see him around.
When you're cheated on you can be mad, but if you're still mad and would fight him again then that's wrong. You need to let it go and move on from your ex.