Family & Friends

Has he backed off because I made him think I wasn't interested? Can anyone tell me what I did wrong?

There's this guy I've known for two years, and we have been friends on and off but we where never close. But a few months ago some how our friendship got rather tense and something about me and him just sparked and we seemed to get along great. We only spoke occasionally but when ever we did chat I enjoyed talking to him. Knowing he had a bad boy reputation and understanding what would happen, I agreed after a while of him chasing me and trying to get me on side to meet up with him and hang out, but my friend tagged along but he was fine with this. Also, as of this point me and him are great friends but he insisted in making a firm reminder to me that he had a girlfriend and we where "Just friends". I found no problem in this as I enjoyed his company as a friend and didn't feel as though I knew him well enough yet for anything more to happen as I am a sensible girl and appreciated our friendship. But one night whilst I was out with my friends drinking and he was off doing the same thing, we where both in the same area and at 3 in the morning he insisted on seeing me. I agreed to see him and we met up and went back to his place for a bit. After a while we'd sat down and had a chat and he blurted out that, besides the fact he had a girlfriend, he was starting to like me.. And he'd always say to me about how they didn't seem to have much in common and they had only been going out a few weeks. But as he was drunk, and so was i.. I refused to believe him in what he was saying and said tell me when your sober but he told me he had nothing to prove, he'd told me and nothing more needed to be said. After this and a chat about somethings, we shared a kiss and fell asleep together.. After which we both woke up, sobered up a little, he still seemed insistent on liking me, and kept kissing me again but after a while I had to leave and go back to my friends as I told them id be back, and he insisted on walking me all the way back although I said he didn't have to he said its what he does. But after this night happened.. He seems to of backed off of me, and either he isn't interested in me anymore/never was or he's staying away from me for the fact that he is worried I'm going to ruin him and his girlfriend. I don't understand though, we where great friends and before I left him I remember his last words to me where "This Doesn't change anything between us" And I didn't expect it to.. but the problem is it seems to of changed things, and for the worse.. I made a good friend out of him and although he will still talk to me and has said he isn't angry/annoyed with me, he seems to distant and our friendship has just fizz,ed out in the space of a week.. Can anyone please tell me what their view/opinion on this is? Has he backed off because I made him think I wasn't interested or did I do the wrong thing by trying to do the right thing?
Has he backed off because I made him think I wasn't interested? Can anyone tell me what I did wrong?
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