What do I do? I feel gross and used. I don't even like him anymore and I keep telling him I don't want to hook up anymore but he won't leave me alone.
Classy guy. Ew, just tell him to kick rocks. Stop responding
He's telling you this because he wants to hook up with you again, so he's reevaluating what you had and what went wrong (what made it end).
Stop responding. You've already told him directly that you're not interested, but he's refused to accept that, so now you have to try plan b. If you keep the line of communication open, he'll still think he has a chance to wiggle his way into your bed.
Stop responding its thats simple. Dont feel used, just learn from it and move on.
Don't feel used, he enjoyed it. He just wants to get high and hook up again- so if you're down, say ok. If not, tell him you don't want to do that anymore. Done.
Next time he continues this venture, tell him in plain words that you no longer want to hook up with him. Not because you're hurt by his actions, but because you're no longer sexually interested in him. Apologize for being blunt. Politely thank him for the fun and tell him that it was mostly good, and assure him that he has some potential in the bedroom department. If you're feeling vindictive, tell him you've found another hookup partner who satisfies your sexual needs better and you hope he finds what he's looking for too. Use smiley faces.
Ignore his texts, Ignore calls. Simply erase him from your life. You deserve so much better.