Long Distance,How to Keep the Love Strong ???!!!?

My guy and I have been dating for a year now,and i must say! he is the Best bf i have ever had, we connect on so many levels we have never fought,no arguments ,he says im the one for him and i believe him because i feel the same we both have had bad relationships in the past,being in a serious relationship then getting cheated on afterwards (Sucks) so we know what we want from each other,,we even have talked about engagement but not now! because we want to be financially stable ,im 19 and he is 20 hes finishing up school and then enrolling into the military and I'm currently in college im moving 5 hours away to Virginia in Late Sept to stay with family and continue with my education ...we are currently in a kinda long distance relationship that's two hours away ,what should we do?? i know im going to get depress =( and when i mention the move he get quiet,i know i will stay faithful to him im truly in love with him,..please any suggestions on keeping the relationship strong..i was thinking a promise ring.