My heart is breaking and I'm torn in the middle of myself....how do I let go.......?

I'm 15 years old. Right now, I am very discouraged. A few hours ago, I wanted to cry, but the tears wouldn't come. Well, eventually they came. I am not bipolar, just very emotional. I'm very tender hearted and I get hurt very easily. About two to three months ago, I found out I was moving to Arizona. I live in New York currently. I have lived here for 5 years now. I was SO estatic when I found out we were finally leaving. My whole family is up there and I've wanted for so long to be close to them. I had wanted it for such a long time. But now.....I see....that I didn't mean that....I've met so many wonderful people.....and I'm going to have to leave them all behind.....leave it to me to make friends with all the seniors at my school.......one of them just happens to be.....a boy who is one step below becoming the love of my life. Yeah, I know what you're thinking. You're 15, you can't be in love...But oh..I can. I've been through so much pain and heartache.I don't have the courage to cut myself and believe me i've tried. So, what I always revert to is isolating myself from everyone and crying it out long and hard. Then sometimes I write out what i'm feeling, and other times I dance it furiously out. I am in the drama department at my school. When I'm acting, that's just a way of hiding how I'm feeling....at least for a little while....but inside I'm screaming and clawing at the walls...and eventually I crack...... But......this boy......we met in January, and ever since we met, it was an instant connection. Everyone knew we were crazy about each other. But people started pressuring us and asking us if we were together....and he wasn't ready for that (although he was the one holding hands with me, always coming around me, and kissing my hand. After a month or so, the awkwardness dissipated. And we were right back to where we started from, which made me really happy. Recently (approx about 3 weeks ago), we were at the last dress rehearsal for our final play of the school year. We happened to find ourselves alone....we went from a heated embrace to pionate kissing. We texted later on that evening (I was floating on air :) ) and we both felt it was best to keep what happened between us secret. But he told me, "You gotta admit that's kinda hot. Us, secret." So, whenever we got a chance, we would go be alone (usually it was on the evenings of the shows). While everyone was getting their make up and costumes on, we snuck away and spent about 10-15 minutes alone together, just kissing and caressing each other. I let him touch and rub my , which I've never allowed any boy to do. Eventually I let him take my entire shirt off and do different things. As Taylor Swift says in one of her songs, "It was wrong enough to make it feel right." After the show was over, we couldn't really sneak away to our private place anymore because there were too many people around. So we were texting together trying to figure out how to get alone again. I finally suggested to him this weekend that he come over to my house after school while my mom was at work. We were both very excited. He came over yesterday and as he walked in, he looked at all the boxes (he knew I was moving.) But then he turned to me and said, "I was about to ask why all the boxes but then I remembered..."And he didn't finish the sentence. he looked so sad, I could feel it and I just ached inside because....I'm going to be leaving him. Anyway, we went back to my bed room, he pulled me into his arms, and pulled me down onto the bed with him. We kissed and he slipped off the short summer dress I was wearing. He took off his clothes.....it was the first time I had ever seen him naked.....and he was so beautiful...everything about him was....we ended up doing pretty much everything except .....he could only stay 45 minutes because he had to get to work. But I walked him to the door, and he pushed me against the wall and touched me and held me and told me he was coming back. I felt so alive, but ached that he was gone. But I was so excited for the next time. I figured he wouldn't come over today, and he did end up texting me saying, "I'm probably not coming over." I texted back and said, "It's cool. I mean, I don't expect you to come over everyday." He texted back, "Cool." And I texted back, "Just let me know when you're ready." I broke down crying this evening because I want to spend so much time with him...I only have about 2 weeks left before I leave. He's a senior, I may never see him again, but we've grown so close, at least I to him. I don't want to say goodbye. It kills me everytime I think about it, everytime I see him. please, what can i do? How can I get through this, Do you think he's hurt or upset I'm leaving? I don't want to leave h