I have an ex-girlfriend that I'm going to aggressively touch.
That's horrible, why would you ever aggressively touch your ex-girlfriend?
When people are angry they will do things to release their anger
It's absolutely wrong, and illegal, to aggressively touch anyone. You need to learn to keep your hands to yourself.
I bought her a ring so I can do what I want.
Buying her a ring does not give you the right to do what you want and touching her, or anyone, in this way is horrible and completely unacceptable. Be a mature adult and leave her alone. If you do this there is a high probability you will get into trouble.