What should I do to get him back or is it even worth it?

I met this wonderful Libra man back in october of this past year and we really hit it off but he's in the military and, lo and behold, he was being sent away in february for a year and a few months. I told him I would wait for him, because I could, but when he comes back he is due to be sent to either Japan, or washington, which for me is on the other side of the coast completely. I told him I couldn't move with him, started punching holes in our relationship, and eventually we broke up about a month ago. I know it sounds quite ridiculous, and if not to the readers, then it does to me, but I seriously thought that being away from him would distance any feelings between us but I was wrong. I tried dating somebody else, but God knows I started crying when I was with that guy because I couldn't stop thinking about my ex. No, I wasn't drunk or even on drugs. Ever since then, memories of him fill my mind, how much I miss him and everything about him and if given one more chance I would definitely wait and certainly move with him. I feel like I could do anything and more to prove to him how much I love him and would like to be with him. We are talking to each other again are due to get together and hang out as friends before he leaves, but I don't know if I should tell him how I feel or what. I would wait longer than a year to be with him and am willing to wait if there is even a 1% chance that he will take me back because to me he is definitely worth it. Nobody else has ever made me smile that big on the inside and outside, and nobody else knows me better than him. Even for it only being a few months. It feels right but I am scared to death of being shut down when I have only one chance to get it right since he is leaving on the 19th and I am not sure what I should do much less what I should say. He told me he didn't trust me anymore since I backed down because I didn't want to do the whole year and then move thing, not to mention he's still kind of bitter towards me and I detect a small amount of resentment even though he claims not to be mad at me. Not to mention he said in an earlier email that he thinks the way things are now is for the best.