The desire remains. No other suitor measures up to him. He makes everyone else seem boring. He was vastly out of my league and represents everything I want but can't have. I'm obsessed with him, and though I'm ashamed of it, and it disturbs me, and I'd die of embarrassment if he ever found out, I want him. I can't stop wanting him. In my head I see us together and then am overtaken by disgust at myself.
In my opinion, attraction has to do with what/how the other person makes us feel. As in, strangely, it's not about them. It's not strange to me that you still have desire for this person because there is a huge aspect of them that makes you feel actually good about yourself. You feel special by being his proximity/gaze - charisma is common in abusers, and it sounds like he has it. Also, you consider him to be out of your league - which means, by being with him you can believe you are in a different league -and that you have the things you always wanted.
But you've got the contradictory element of the abuse, which naturally also causes you to feel repelled.
The way to work on it, I'd think, has to do with working on your own sense of self and self-esteem. For all you know, you might be just as magnetic as you perceive him to be. You might be just as 'top league'. Actually, those things aren't anything but strong sense of self.
I don't mean to make it sound easy. I have zero sense of self most of the time. But this issue of your attraction really isn't about him - it's about you and what you are missing in your own identity that you (rightfully) crave. I think it's not a bad place to be, because at least you want to feel those things for yourself (some people just don't). You do have the grounding of a healthy ego. You can spend time cultivating it.
Just need to say it again - you aren't obsessed with
him, you are craving that feeling of specialness. He's a distraction from the main thing.