Im so hurt and cant stop crying, How would you handle this?

Well about 9 months ago I started talking to this guy on facebook. He went to another school than me and was in a grade ahead of, me 11th, him 12th. Well after we met things were really good, he has a car and job and came over my house one night about 5 months ago. He was one of the first guys I had that got serious because Im overweight (Im still cute and everything, but I dont get guys as often as the average girl) Even though this was then and I've lost 53lbs since then and still losing. Well when I first met him like i said he came over my house and we awkwardly sat on the couch around each other, he kissed me to break the awkwardness, this being my first kiss I fell head over hills for him. Over the next weeks he came over more, we text everyday and things were good.Eventually, he got my virginity and we began having sex. But then when I started pushing for more like going out, him calling me at night he pushed away, the text stop coming and I only heard from him once a week. I should I have known to leave him alone then. But I guess in the back of my mind, I still had memories of the good things he used to do and I thought that maybe If I started to give him everything he wanted and just sat back and be cool, he'd wanna do those things on his own. So when ever he wanted to come over and "chill" I let him. But then I saw that he wasnt going to change from me doing just that alone, so I sent him text telling how I felt and the first time he said he'd begin doing things like he used to. But he lied he didnt and so the bad thing is i think i kinda got used to it because he kept doing those things and I was still here just dealing with it. Then he told me about going to Atlanta to live with his brother or something, So i felt sad because I have no one else to be with besides him. Btw this is all the week before his graduation. So I sucked it up and just tried to make the best of everything. But only the other night he text me and asked to come over, which was kinda fishy, hes supposed to be in ATL right?? But all in all he stood me up and these last few days I found out about his gf, and I've seen pics of them together and everything. When he text me he wanted to come over and have sex. Which would be cheating on his gf! But he didnt come so I guess he does not want to cheat on her. But the thing is I feel like he left me for her, that I couldnt do what he wanted.. I feel like I failed, and im not sure if she came before me or not. All I ever wanted was to be with him in a relationship, but hes in one with her now and they're all lovey dovey on their twitters. This just came out of nowhere and he just dropped me out of no where. How would you handle this, confront him about it, or just leave it all alone??? He was my first and I really regret it because we were never in a relationship and in love or anything. Sorry its so long!