i do think you should break up and walk away from this. you took your anger to another level. you shouldn't have rough sex with the next girl because it will inevitably be taken to the next level yet again. you need to do some yoga and calming things and some therapy obviously to get past this. it's a mistake but don't make it again. your relationship is scarred with this for both of you, you can't start fresh from this. don't think for a second that you can. it's over...otherwise you will become the person you don't want to be.