What do I do now ?

I'm talking to this guy and he is the sweetest thing ever. He treats me like a princess, even though I'm not entirely sure that I deserve that. I think I like him, but if I don't, I'm leading him on by saying that I do. I want to like him and I don't see one thing wrong with him, but I just don't feel anything, really. I've always been like this. A really sweet guy comes into my life, and I just push him away because I don't feel anything, but when he's gone, I'm a mess. Anyways, we're not dating or anything but I still feel guilty because the other night I got together with another guy and we did things. Things that would make another person mad if we were dating, but that's the thing, were not. I don't know if I should tell the guy i'm talking to what I did or if I should go with my gut and tell myself that it's none of his business because we're not even dating.