LDR or long distance relationship right now it not a matter anymore. with the great development of information technology, pople can get closer even their have a long distance. But it can not be denied that in relationship, we need keep our chemistry growing, and its really hard to get if we separated by distance.
LRD also can test us (you and your girlfriend/boyfriend). me too, until now still have LDR with my girlfriends. Right now my advice are, dont think to much about how keep your girlfriends loyal to you. just think, how you can b loyal to your girlfriends. Have a trust in her, and commitment with your relationship. Make a goal in your relationship like, when will you get into next step your relationship like married.
thats all i can give.. hope you satisfied with the answers.