I'm kind of in a long distance relationship with a guy that has a girlfriend and they've been together for 7yrs?

We email and message each other every day, we sext and have phone sex frequently, we make normal phone calls too, I know he has sex with his girlfriend and that kills me, but when I mention having sex with someone he doesn't seem to care, he says he loves me, does he?

Or am I just being used to be his fun on the side and he actually doesn't care about me at all?

Why is he doing this?
I'm kind of in a long distance relationship with a guy that has a girlfriend and they've been together for 7yrs?
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