Why do guys tell me I'm beautiful but they never seem to show interest?

my male supervisor called me a beautiful young lady with huge emphasis but he didn't show any interest in me. Similar thing happened a long time ago where a janitor gave me a first bump, told me I was "so pretty" but he never asked for my number. Very rarely do guys show interest in me. I've also had other old people tell me the same thing but young men seem to be interested

Why do guys tell me I'm beautiful but they never seem to show interest?
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