Aggressive Nerd! Help?

Hm. It sounds like he could have anger issues, or a mental disease. Overall I say, be patient, but remove yourself from that situation. You aren't sure how aggressive he can be. You need to tell him that if you are going to be friends, the violence needs to stop. Hitting is never ok. But if I were you, I would end contact. You don't deserve to be treated that way, (thats not friend behavior) Good luck.