I cant help but wait???!???!?!??!?!?

I have been dating this amazing beautiful guy for a year with the exception of one break up. I am 19 and ppl that really know us or just me they know that I really love him. There is not one thing about him that I dislike.YES!! Even the annoying things make me smile. I have never thought I would have created such a strong bond with him or with anyone at all. When we are together noone matters but us. I swear when he looks at me EVERY time I just feel like the most beautiful luckiest person..We are very much in love..I cant descibe the feeling he gives me but its like our first date over and over again. Greg joined the Air Force a while ago to pay for graduate school. He got stationed close to home just so we can be close still however he started acting really strange. We NEVER ever argue bc he hates drama and seeing me upset so we try to get along as best as we can..but the last month I have been spending so much time defending our relationship then actually having one. When we are intimate I dont feel like we both are enjoying each other anymore and its not like were making love. I finally couldnt take it no more so I asked him what was OUR deal..whats happened to us.. He told me that he was leaving for Iraq and that I was the most important thing in his world so he does not want to leave but he knows he is a man and dont want to let anyone down. He thinks that I will not wait for him and that I will somehow get distant feelings for him. I will just say this...I try to think about my life without Greg and I feel like I am sinning. I truly believe God designed Greg just for me and I am going to school and working 2 jobs bc I know one Day I will be his wife and I want to contribute to the amazing life we are going to have. But its so hard bc his worry is He doesnt think I am going to be waiting for him. And my biggest worry is I wont have nothing to wait for.. I dont know what could happen up there and what he can get himself into..and it scares me soo much. I have gotten myself sick bc of the thought. I pray for him more than I pray for myself and I know that I am in love. It feels so gooddd!!OMG but I just dont know how to handle it. Being in love comes with so many challeges I am realizing bc we never had a big problem like this..actually no probolems but now our emotions and feelings are really coming out!! Anyone who has been in this siutation and has prospered through it please give me encouraging words bc I need it soo bad. I love him so much its making me crazzyyy!