My guess (from personal experiences I'm going through right now...) is that he still loves you. But he's probably infactuated with this new girl. And he most likely doesn't know what to do. He is telling you what you want to hear in case he decides he wants to be with you, and is probably telling the new girl the same things in case he wants to be with her.
Don't think hes being a player or anything; he's just as confused (if not more) than you are. I'm going through the same thing right now. Just when I decide I want to stay with my gf, I wake up the next morning completely against staying with her. It's just so hard and confusing.
Think long and hard about if you really want to be with this guy. If you do, then fight to get him back. I think him seeing that you are trying to get him back so hard might snap him out of his problem. That's what has occasionally worked for me. Be cool, be caring, be nice, be funny, and above all don't be a B (you know what I mean...). If he decides to dump his new toy for you, then you can rest assured that he loves you. He wouldn't choose love over infactuation unless he was sure it's love. If he keeps his toy then oh well, he probably would have just ended up cheating on you anyway as he is more into looks than people.
If you want to swap relationship stories or just wanna talk more about it or anything my e-mail is email removed . Good luck with this and anything else you may encounter in the future.