Leaving

How do you ladies deal/ cope with knowing your significant other will be leaving soon. My boyfriend and I are both military but he got projected orders to go somewhere far from where I am. I don't want him to go, I really am gonna miss him. He is what makes it worth being where I am stationed. We thought he was gonna stay because usually they just keep them here after AIT but with him that's not the case. I just don't know what to do everytime I think about it I want to cry. It just really sucks he is the only person I have here and now he'll be leaving soon.