Guy's Behavior

Why do some guys date down?

I’m sorry if I come off as shallow. There’s this good looking guy I really like who started dating this chick a bit ago. I never made clear moves on him (since I was dating someone when I first met him) but he tends to be a bit of a flirt with me. And I feel back then I’d even make him a bit nervous. I think I’m a pretty girl with a funny and easy going personality. The girl he’s dating though, while super shy and very sweet, isn’t the cutest. But maybe guys like the demure vibes?
Why do some guys date down?
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