What gives? Why doesn't he just introduce himself or talk to me?

This male co worker that I have never met before waved at me from his car as I was leaving my shift and he was starting his. The next few days I caught him staring at me while I was talking to a female co worker in the parking lot before I was leaving for work.. So is he interested? Admiring my beauty lol. Not being conceited at all. Just wondering what you men are thinking and why you would do such a thing and not approach. I smiled when he waved at me not to be rude.
He's afraid of rejection
Doesn't want to scare you
Can't tell if you're interested
Intimidated
Other, share opinion please
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What gives? Why doesn't he just introduce himself or talk to me?
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