What is his ******* problem?

My best friend Jamie, got into a fight at school. Sure he is quick and can break a guys nose, but against a jock he will lose. I am also the reason he got into the fight. The jock who named Tyler was looking down my shirt at subway. Jamie glared at him and told him to stop. I tried to grab Jamie's hand to lead him out, but he told me to let go. I did. A few mins later they were outside. Jamie was on the ground so I pulled him away. Then went up to Tyler and punched him. I gave him a black eye and a fat lip. Now Jamie won't talk to me. What did I do? How can I fix it? He is like my only friend.