I can only say what I would do in your position. I'd remain loyal to the girl you're seeing now. Loyalty is one of the best and most noble attributes of the entire human race, and I couldn't looking in the mirror in the morning if broke off a relationship with a person I cared about simply because it's expedient. Feelings for another person may be natural and (I'd think) sort of instinctual in long-distance relationships esp. if there's not much contact between the two...uh, parties. I'd just make more of an effort to contact the person I cared about if that happened.

Adrian