Ok so this seems really dumb but about 2 months ago I told this guy I liked him, and he said he liked me to but the only bad thing was he had a girlfriend at the time, I will admit that I did flirt with him a lot and he flirted with me a lot to, I grew stronger and stronger feelings for this guy, and on valentines day he asked me out, so we went out but yesterday he said he wanted to break up cause he's not ready for a relationship, and don't take it personal, he was the first guy I cried over cause I liked him so much! I don't know what to do anymore? Please help

Sometimes love just hurts. He might not have been a good boyfriend in the first place if he was flirting with you in the past while he still had a girlfriend. He might have done the same thing to you. I wish you the best.

He asked me out again and I said yes do you think that was a good chocie?

Sure, see how things go. But if he explicitly told you he is not ready for a relationship, don't think that he will change his mind. He has warned you.

Another problem is he never wants to hang out with me when I'm with my friends

How old are you both? Maybe he just enjoys dating but doesn't want to hang out with your friends. Guys can be like that.