Idk the environment you're in, but such characters usually need an audience for you to have any success with getting them off your back. eg. If you CAN, I'd ask for a mediator, preferrably a superior, siting you want to resolve work place friction before conflict ensues... What you then do is, you tell him that his behaviour toward you was very hurtful, you want to understand why he treats you like that. THEN, before he responds, apologize for lashing out at him, but it was bcoz you were hurt and confused. That way, a superior knows whats going on, WITHOUT you having to point a formal finger i.e file a complaint or whatnot. Alternatively, you could give him the same speech informally (really, you're 'apologizing' who could object) infront of a key audience whom you think would be beneficial to your cause... So that way, if he does decide to play the victim, the people who matter will know you're not a vindictive character, but an honest and humble team player... Just a thought.