Hello Otteaga: This is a difficult situation for sure. I would think some candid discussion between you & your GF might be in order. It seems to me you're kind-of stuck right now. From what you wrote it sounds like you have no social life to speak of. You're either working or you're with your daughter. So all of your "instincts" for socialization, so to speak, (to say nothing of intimacy) are focused on someone who's 300 miles away most of the time.

My "instincts" tell me this may work for awhile. (In fact, it has worked for 2 years.) But it is unlikely to work for allot longer. You're already suffering the effects of loneliness. Of course, I don't know how your GF is feeling. Perhaps she has more opportunities for socialization than you do currently. But either way, it would be my thought that probably sooner rather than later the two of you will have to talk this out & reach some decisions with regard to where, if anywhere, your relationship is going.

If, realistically, there's simply no chance of the two of you being together any time soon, then perhaps it would be best to at least put the romantic part of your relationship to rest for now. If it simply can't go anywhere, there's no point in fanning the flames. You would be better served by taking a look at your current living situation & trying to figure out how you can incorporate some opportunities for socialization with other adults into it. The two of you can, perhaps, continue to be friends. And down the road, depending on how things work out, the romantic aspects of your relationship can be revisited when it becomes more practical for the two of you to be together. These are my thoughts with regard to your situation, anyway.