I love him and now he's leaving. What should I do?

Well, we weren't even supposed to be together. Our families didn't like it. I suppose they thought we'd get into doing bad things or something, Idk. But, we were together anyways. For almost 2 years. No one knew, although they were suspicious. But it was the best time of my life. I couldn't have been happier. Everything was perfect. We were even talking about the future and trying to make plans for marriage. He bought me a promise ring... And I would get to see him almost everyday because I was friends with his sister. Life
was just great. But now, he has to move because of his family. He had wanted to run away, but I said no because life would be to hard. We haven't finished school and didn't have jobs and I thought it would be better to at least finish school, you know? He said we'd be able to keep in contact and one day everything would work out. Bit lately things have been hard. We haven't talked in almost 3 weeks. I'm trying to be understanding, but it's hard. Sometimes I worry that he doesn't even care anymore. He told me he did and that he always would.. So. I trust him. But, I just miss him so much. He hasn't been online to get my Facebook messages. Nor has he texted or called. And seeing as how I'm not friends with his sister anymore, I don't want to call and make it too obvious we are together. I sometimes wonder if it's his family. The Dalton I knew would do anything to get ahold of me.. So idk what's up. But I just miss him. I know I should probably try to move on and live and have fun and etc but I really just can't stop thinking about him.. more than that, I don't want to.. Uh. I just don't know what to do. I keep waiting for him to contact me.. but he hasn't. I just keep waiting. And crying. And it sucks. Any advise? I'm sorry that this was so long.. Lol, funny thing, this isn't even half of everything. Ha..