I like this guy but he has a girlfriend

Me and this guy were starting to get to know each other, flirting, talking a lot. he sang to me via webcam once and would take out his parents car when he only had his permit to talk with me at my house. There was this other girl he had a thing with for...

awhile now and supposeably they went out a little but she randomly broke up with him. I always thought they were just friends, cause that girl was a complete FLIRT. (btw we hang out with the same crew and flirts with all the guys).
now they are going out again, and it was totally random. I had seen pictures of them hanging out with other people a couple days before they started going out and I got really upset seeing them. then when I saw on facebook they were going out, I fell apart. it hurt really bad and he started not talking to me on aim and not talking to me at school anymore.. I later found out he knew that he was ignoring me, and he felt really bad. eventually, I got over him and we started talking and being friends again. recently, he told me him and his girlfriend were having problems but he didnt specify what they were. but I know he really likes her and I think they worked it out cause I saw them hanging out after school. what should I do now? I say I don't like him, but...I dont know..

FORGET HIM YOU SHOULD NOT HAVE TO BE HURT OVER NO ONE. JUST FIND SOMEBODY WAY BETTER AND WATCH HIM SQUIRM. NO GIRL DESERVES A DOG , YOU ARE SO VALUBLE. YOU BETTER KNOW YOUR STATUS. JUST REMEMBER THAT YOU ARE A DIAMOND AND NOT ONE OF THEM BRICKS OUT THERE BEING A SLUT I HOPE THIS HELPS!!!