Why would a guy reject a pretty girl?

Anonymous
There was this guy who always stared at me, would smile like he'd won the lottery when I spoke to him, and it was fairly obvious he found me attractive. But he has issues with his confidence and appearance and once told me he'd even turn off the TV if his girlfriend or wife was into the guy onscreen.

Anyway, I told him I had feelings for him and he gave me the "you're a nice girl" rejection saying "you'll meet the right guy" and "there's better guys than me."

It was upsetting because I liked him so much. Why did he reject me after acting the way I wrote about at the start? Can guys really not feel adequate enough/ don't want to date the pretty girl?
Why would a guy reject a pretty girl?
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