Why are you humiliated? And what's wrong with the people at this party that no one reacted appropriately and told him to leave, after the first hit?

He's not a friend. He has serious hostility toward you that he managed to hide when he was sober. You could have called police and had him arrested. You didn't, which was a gift to him. Forgiveness is something you think about after a person expresses remorse. He can't because he doesn't even remember doing this.

Have absolutely nothing to do with this guy when he is drinking. Never be alone with him. If this is your idea of a friend, keep the friendship. Myself, I would have nothing to do with this guy again. Even if I forgave him. I'm not in this world to be a punching bag for anyone.

Of all the people there, he picked out you to assault. Why you? He has zero respect for you . . . ZERO.