I agree with Shez... This just doesn't sound good at all. And what stuck out to me even more than checking out other girls is the fact that he told you he can just buy any girl's love. Does that mean he's buying your love? Is that how he sees your relationship? I'd want to dig further into this. It does sound like he's very insecure, and maybe almost feels like he's not worthy of love on his own (thus the need to buy love?).

I agree, this is going to be a very difficult process when he's not willing to admit there's anything wrong on his side. I'd try to talk to him about it in a calm manner. Not right after you catch him looking at a girl (I almost want to suggest you take a picture of him checking out another girl to show him visual proof... Maybe he seriously doesn't know he's doing it? Is that possible?). I also agree that you need to work on this sooner rather than later because it's only going to build resentment. Btw, he shouldn't be calling you names like a jealous girlfriend. That's really not fair to you and just puts you on the defensive so no real conversation can come... Practice using I statements like "I feel ---- when you do ----. I would appreciate it if next time -----." Make sure to take lots of deep, calming breaths, too.

Basically, I agree with everything Shez said, but felt the need to repeat... Whoops! Sorry

Good luck! Let us know if there's anything we can do to help you!