I'm hurting bad and I need some help. This is kind of long BUT PLEASE HELP!!!?

You seem like a really nice, mature person, but he might just be playint with you. At the beginning, he was nice, sure. But the whole "my girlfriend and I arent gettig along. I need consoling." sounds like bs to me. It seems like he was just saying that to get you to do stuff with him. As much as this hurts, you don't want to end up in a relationship with a guy that ended his last one by cheating with you because you wouldn't be able to trust him. The only thing you CAN do is keep busy and try to move on. Stop talkig to him and if he doesnt tell his girlfriend about what you two did, then you definitely should. Sorry your first experience had to be like this. But don't give up.