<human>: Could you distill the essence of the text into 1-3 sentences?

So I've been with my girlfriend for two years now. We've had a pretty standard relationship (with its share of ups and downs), but it's now turned into a long-distance relationship because I've had to take a job in the Dakotas (I work in the oil industry) and she's doing grad work elsewhere. We're only one time-zone apart, but we're thousands of miles apart. I can't just go see her on the weekends.

We've always had a very healthy sexual relationship (well, for the most part), and she has a particularly high sex drive (which has been fine for me). We tried an open relationship in the past (sort of) and it didn't work and I found it awful. Part of the reason was because I didn't like the emotional attachment her partner got with her.

But now she really wants to have sex and I can't provide that for her. She's okay with not having an open relationship if it hurts me too much, but I feel somewhat bad about not letting her fulfill her sex drive.

I guess what's worse is that she really only has one friend where she lives, and it was the partner she slept with. She assures me that the sexual relationship there is dead (and I trust her, regardless of the people here do), and that even if we had an open relationship, our rules would include not letting the person stay over night, and that they had to be strangers.
<bot>: I'm in a long distance relationship and my partner wants to have sex, but I'm not there to have sex with her. She's okay with not having sex, but I feel bad. How do I deal with this?