My Not So Nice Friend

I am totaly confused about a friend of mine. im a junior now in high school, and I met my friend joe in the seventh grade. I have known him the longest and the best of all my friends with a few exeptions for some other people. any ways joe can be soooo cool at times but hes also realy ruff with me and hurts me a lot over the years I have had numorous bruises from him. but I always seem to forgive him when he says hes sorry. but the other day we were both joking around in class and he asked for a pencil and I kept pretending I was going to give it to him and then id take it away, I mean we were BOTH laughing about it but then, he acted like he was all mad about it at the end of class and he was all ‘’youre gunna get it’’ and he pintched my arm so hard I had an instant bruise I was soooooo mad at him I hit him in the head just to get him to let go and he thought it was funny. thank god it was the last class of the day because I was madder then I had ever been I wanted to cry so bad. I give my friend brittany a ride him every day and she even told me I cant beleive he did that to you. I really dont think I can forgive him this time, its like I’ve just known him so long I HAVE to forgive him. should I or should I finaly pull the plug on our friendship?????????????