I hurt him before and I don't know what to do

So there was this guy that I liked last year, and he liked me. We didn't know that we liked each other until he told me in October. We continued talking for a few weeks after that but he did something that was kind of unsettling for me. Trust me, it was nothing bad, I think other people would have been flattered by it, but I'm so uncomfortable and out of touch with emotions and showing affection that it thoroughly creeped me out, and we pretty much stopped talking right then. We've sent very few messages back and forth since then (now not since April, and I intentionally waited upwards of 30 minutes before responding with short, brief messages), and all those conversations had been initiated by him. I really want to go back to being (only) friends with him because I enjoyed talking to him. Conversations were always so free-flowing and easy. I also want to let him know that nothing that happened was his fault, it was all me (truly). But at the same time, he definitely deserves a better friend than me. I think I was being selfish, and I know I hurt him (he told me later that he felt like an ass for letting me know he liked me). But I don't know how to tell him any of that. I also don't want to embarrass myself because I know he talks to his younger sister, and she has a big mouth.

*It might not make that big of a difference, but I thought I should say that I was never outright mean to him; I never berated him or called him names or anything of the sort, nor would I ever.

**We've also both graduated by this point, and he now lives a state away.

***Additonally, I can never stop thinking about him. I don't know if it's a guilty conscience for hurting him or that I still might have feelings for him.