I agree with all of the above posts...adding again, don't think you can fix him! That's one of the first things an abusive partner will do, right after they hurt you....beg you to give them another chance, and insist only YOU can help them become a better person. It's b***shyte. Your relationship is already spinning out of control and the concern you feel is your brain warning you so you can save yourself before you hit the floor.

TRUST US...........GET OUT NOW. AND DON'T LOOK BACK.

(that means any contact you can avoid with him, avoid it, even if it means you have to change classes so as to NOT be in a class with him. Tell your teacher about this, counselor...someone so they know, so it is documented.)

Take care