Why do handsome guys do this?

I've noticed that handsome guys would deliberately avoid eye contact with me but then look at me secretly. Once I was walking on the street, checked out a tall handsome young dude then immediately looked away, he didn't make eye contact with me, pretended to look at the window glass next to me (maybe to secretly take a peek at who I am). Then when I looked back at him for a millisecond, he just dodge eye contact and resumed walking

Similar thing happened at the hospital where I interned, i would look at a hot guy (med student), he would avoid eye contact.( I wasn't staring by the way). Then after a while, I noticed him staring at me out of curiosity, out of the corner of my eye, when he thought i wasn't looking

I wouldn't say im the most attractive girl. But attractiveness is in eye of beholder. But do guys do this when they're not interested?

Why do handsome guys do this?
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