Entitlement/habit.
Most guys she's dated, SHE has had to be the one to put the breaks on. He always wants to see her/have sex with her, because even in a relationship, most guys are thirsty as fuck. She legitimately feels like you're not doing what her other guys have done. And she feels like that's because you don't really like her that much. Most girls are very insecure and need to be assured(in various ways), that you actually do like her.
I'll tell you how I handle it, though your milage may vary, as we seem to date very different types of women. I flat out tell them that I have a great time with her, only seeing her twice a week. That I've never found myself feeling the way I do about her, with someone I see every day. It's special and makes me look forward to seeing her. And then I ask her if she's used to seeing most guys a lot more often(almost always a yes). I ask her if she thinks she likes them better(always no). I think time apart just makes us enjoy our time together that much more.
Though another thing to keep in mind, is that I always do this, after having established our relationship as temporary. I always tell her early that we will eventually end. We won't get married, we won't have children. If you like to pretend you two have a potential lifetime together, I'm pretty sure this would blast a hole in that perception.
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Quote:
Build an emotional connection through your hard throbbing cock.
Build trust and comfort by holding their hands and covertly rubbing your elbows on their nipples.
RSDTyler