He stares at me, but he doesn't like me?

okay, so over the last few months i've noticed that some guys (that i find attractive) stare at me. they dont do it in a " she looks ugly" or "there is something wrong with her" they just look at me, and i feel as if they like me. next thing i know: they have a girlfriend and are making out with them on the corner. i dont get why no guy comes up to me, or does anything to get my attention. i dont think im ugly, although i may be a bit chubby; im also i more reserved person. i just dont get what i am doing wrong.

this has happened more than 2 times to me.
He stares at me, but he doesn't like me?
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