What was he trying to tell me?

I've been seeing this guy for a couple months. A few weeks ago, we were together and he started asking me all these questions, like what I want, where I want this to go, etc. (he has a g/f. Don't lecture.) Then he starts rambling on about how emotions are involved (he was a bit drunk), and when I got defensive and told him I'm not in love with him, I'm just having fun (yeah, I lied), he got this weird look on his face, almost like he was hurt. I thought that's what he wanted me to say, given our cirstances. We were so close up until that point, but now, since then, he seems really distant. We still hang out, and things are fine when we do, it's just not nearly as often and it just doesn't feel the same. He's still really nervous and jumpy and extremely attentive, still compliments me, gives me tons of attention. He's just sending out a bunch of mixed signals now. Was he trying to tell me he's falling for me, and did I reject him without even knowing it? What do I do?