My 6 month relationship was in jeopardy when I relocated to London. She says she physically can't commit to me, and wants to break up. I think that this is because we hardly ever see each other. Deciding to maintain an open relationship is working on the problem - it's just not the answer you want to hear right now. Being in love is merely a feeling.
Love has to be put into action to really mean something.
You cannot put your love into action from thousands of miles away, and she won't be able to feel you, see you or touch you. So to her, pining over a man that she is in love with makes no sense. She would rather love the one she's with. I was a victim of some infidelity in a past relationship. I've noticed that women seem to bounce back from things like that in a short time with no problem.