If he loved you in all truth he would take you with him. Marines are allowed to Marry and live in Base Housing with their wives and have little babies. Life is very much normal. Marines do get called away but it is usually for 6 months or a couple weeks here and there. I liken it to a much needed marital vacation. (lol) Alot of Marines are still able to sustain their quality of family life. I agree with rudenski...your boyfriend is using you as insurance.
He loves you and the idea of you, but he most likely isnt IN love with you. You need to cut that soul tie and move on to a Higher more infinate True Spiritful Love!! (and you also need to love yourself)