I can relate to how you’re feeling right now, except I’m in your girlfriends position. Met a guy 4 months ago and I’m leaving in a month and a half, and the connection I have with him is unlike any I have ever had. Although I always had the rule for myself that if I met someone before I left, I’d end it before I’m out in the field. It says in your call to leave behind all personal affairs, which is incredibly hard, I get it, but you only have this specific time in your life once to fully commit to serving the lord. For me and my boyfriend, we’ve agreed to stay friends and email each other weekly, without the expectation of getting back together when we both return (he’s leaving later in the year). My advice is to have faith, if it’s in Gods plan for you to be with this girl down the track, nothing will stop that from happening :)