It is possible to be "addicted" to someone, and I just have this feeling that the image you have about him in your head, how you perceive him, is not realistic. And you are "addicted" to this idea. You know he is bad news, yet you are somehow attracted.
And you are well aware that having sex with him would not change a thing. Honey, a guy who cares and knows you are a virgin will certainly not bite you, bite hard. He will not do anything to upset you. He will understand your feelings and respect you. You may not be "compatible," but it seems to me he was taking out his frustration on you.
Consider yourself lucky, young lady. You are 21! Enjoy your life, enjoy your youth. Don't let some little punk with no future ruin your self-esteem. Excuse my French, but sc***w him.