I'm pissed after I found out my girlfriend stayed over at her ex-boyfriend's house the night before thanksgiving.
Don't you trust your girlfriend to do what is right?
I don't want to give the bitch any rights.
I can understand how you are feeling about the situation. It is wrong to stay at someone's house without telling the person you are dating. She should have asked you about or let you know what was going on.
She told me but I punched her in the face
So basically you knew about it and you punched your girlfriend. You cannot expect your gf to be with you if you treat her like she's your property. If you really like her stop abusing her and apologize for your behaviour.