Answer:
Show him that you've moved on. Take care of yourself, cos it's time for a makeover. New haircut, new wardrobe, do exercise, eat well cos it will boost your confidence. Be happy that now he is out of your life. Consider that as a positive, rather than a negative. Cos maybe your were never meant to be together in the first place, but you deserve someone else's better. Don't find a rebound relationship just to get back at him because that never works out and you will be the only one who gets beaten in the end. Cos when he sees you after the breakup looking radiant than ever, I'm sure he'll feel sorry for himself that he ever let you go. -- ChinGleek
If the deed the ex boy friend did was bad enough,then a common extreme form of revenge would be to go and have sex with his brother or his best friend or for a more painful revenge sleep with his father,then tell your ex every specific detail of the encounter and tell him that it was far better sex than you had ever had with him.Then sit back and watch the turmoil and resentment begin to flow between them.