I dated a guy like this, one time only. I thought we were heading somewhere, but when I asked "So where is this going?" he dug in his heels and said he didn't want a relationship, there wasn't enough chemistry, etc.

So I bailed. Months later I decided I was fine with just doing a FWB thing with him, since I assumed he still didn't want to actually date me. Then I met my (now) husband and promptly ended things with the original guy. He was actually pretty hurt by it and made a few mean comments about me to mutual friends. Well damn dude, I was just acting on what you told me, you missed the boat.

He was very obsessed with having this "cool guy" persona and wanting to have it all. He often bragged about how much women wanted him, and before me he had dumped a (gorgeous and super nice, in my opinion) woman because he said she was too into him. Personally, he just wasn't used to being rejected, and when I rejected him the first time the reverse psychology seemed to work on him.

Disclaimer: It's not like it would have actually gone anywhere fruitful had I ended up dated him the second time. Obviously he wasn't into me enough and we had different goals, it was just the "want what you can't have" factor that momentarily changed for him.