What do I do with this guy who has a "girlfriend"?

Ok so I’m pretty much in love with this guy. He is in 11th grade and I am in 10th. I met him near the beginning of my freshman year. He got a girlfriend the summer before that but she moved like a thousand miles away before school started. They have stayed together since, It didn’t bother me much last year even though I liked him. He would do sweet things for me soemtimes (let me wear his jacket when he was cold, bought me sodas and cupcakes etc.) but I never took anything too seriously because I didnt think he would ever like me. The beginning of this past school year I had a lot of drama and he helped me through it after losing my best friend because I did something stupid. One day we kinda hooked up. We didn’t do it but came close. Afterward it was kinda awkward but he told his girlfriend about it and she forgave him. In the months since then..stuff has happened more and he has become my best friend ever. We hang out a lot, tho we try not to kiss much, and we are together so much people are always asking if we are going out. I even got him to go to homecoming with me as my date. I have had so many talks with him but he won’t break up with her. I was feeling guilty like 2 weeks ago and asked him to tell her what happened and he did, (he even started crying the next day he was so worried he would lose her) but then I looked at her a social site and saw she had been putting this guy as her boyfriend who wasn’t my guy. It was the same on her a social site. I messaged her too and later she replied that both guys knew about each other and noone wasn’t ok with it. Of course I asked him and he said he was “happy with where he is” even though he knows it isnt right. He has told me that he would be with me if they ever broke up, and claims I’m more than good enough..but when I asked him why I can’t have a chance..he said he isnt “enmotionally ready” to break up with her, I am more that tired of all this. I love him and can’t let him go..but I don’t know what else to do..