he says he loves me??

I'm sorry, but what you did with him was wrong. You knew he was involved with someone, but you did it anyways. Youi know he doesn't care about you. He's playing with you. You should really consider telling him that if he wants to be with his g/f, there can be nothing between you, then you you need to tel his g/f what happened.

I agree with them, what you did was really wrong. You should have thought a little more before you did anything. Everyday, there are a million people crying from broken hearts in some way...you may have been that cause of one there. I'm sorry, but that is what I tell my friends when they tell me something they do with other guys who have a girlfriend. You do have to tell her, and stop going to see him. You will just get deeper into it and it'll be harder to get out of.

-Jenna.

You don't. Go about your business and move on. Not your problem. He'll just explain you to his gf as a crazy ex starting trouble. Trust me he will.