What's the best way to manage a partially-unrequited crush?

I went on two dates with a guy who I really liked. He said he had fun but didn’t want to continue dating. I was very upset.

A few months later, we ran into each other at a couple social functions and he asked me out again. I told him I didn’t think it was a good idea, but we could be friends.

When we hung out as friends things got physical on several occasions. I brought up the idea of dating again and he said he didn’t feel like we were on the same page—i.e., that I felt too strongly, I think.

He was out of town for a few months and we have been in touch over email. Last night, I ran into him again at a party. We talked for a long time and eventually he said he wanted to kiss me. I told him I didn’t think it was a very good idea. And later on I did it anyway.

I know that I am behaving really stupidly. I have such strong feelings for him that I guess I keep hoping that he will come around, but at the same time I rationally know that this is basically impossible and things will never change.

Should I stop hanging out with him altogether, since I seem unable to control myself around him? Or is there another solution to this problem that I seem to be missing?