When a girl is happy, don't interfere. If you come back and they're still together, find a new girl. If they split, theres your chance.
Oh yes I forgot. You can ask the military men on here. I think they will not hesitate to tell you about their relationship. If you can find a girl who is willing to wait for you and is loyal and dedicated. You should refer to the military website that will teach her how to deal with being a military man's wife/girlfriend. ^_^