I'm so mad at my ex, I'm thinking of breaking my wrist and blaming him for it.
I don't understand, why would you want to do something like that?
He hurt me emotionally and I want to get back at him.
A false accusation may put your ex in a lot of trouble he doesn't deserve, and get you into bigger trouble if you're caught. Try to move on from your ex and get on with your life.
I won't get into trouble, I just want him to get what he deserves.
It sounds like you have a lot of anger for your ex. Try to forget about what's happened and move on with your life, dwelling on past unhappiness well never help you to be happy.