I'm that girl !

So tonight I went out with a old friend of mine. She had some of her friends from college. There's was this one guy let's call him "J" And from the get go i thought he was good looking. We went out for a couple of drinks. We got talking i found out things. We were kinda flirting to one another. Then my friend tell me that he said to her I was " good looking" I didn't think anything of it. A couple alcoholic drinks later. We made a bet on a game of poll. He had this Tattoo in his ars. So I I won I would get to see his tattoo because I actually wanted to see it. And if he won he would get a kiss. Any way he won. But thing is I've been told by friend and and his friends to be careful with him because he's known as a player.    (Later I found out he had a girlfriend but apparently they were on a break) so I reused to kiss him. But we went out side together alone. He started to staying that he wasn't with her anymore and everything and blah blah. We did ended up kissing after about 20 minutes of him telling me he hadn't got a girlfriend and all that shit. But sright after he was in the phone with her. I went to sit by myself for awhile and to think about stuff. Because right then and there I felt like the worst person in the world because I know what it was like to be with someone like that. After a while I went and sat with him and everyone else. Him trying to feel me up. I was trying my best to not to let anything happen with him. But god he was good looking. We ended up walking shop together. We where talking. Him telling me again how they are a thing. Then ban I pushed up against a wall him kissing me again. All I wanted to to do was to push him off me because off the girlfriend but I couldn't bring myself to push him off me. We started to talk again. We decided not tell anyone. Him trying to steal kiss from me all night trying not to let anyone see. Him feeling me up all night: his hands either feeling my ars or rubbing my inner thigh. I know it was wrong and everything but I only know him for like 7 hours. And he made me feel safe. And no one has ever made me feel like that. I just feel so crap because I know how that girl is feeling. I know it was a bad thing to do but he was different. I need help I don't know what I should do.