Do men just date around when the woman they want is not available at that moment?

So I know this guy who chased a woman for like 2 years. They went out once ig and it didn't work out (its been a year since they went out and like 3 years since he started liking her) . She is single even now but the guy who approached her first is now dating another woman. His friends keep mentioning to the single girl that he had not actually stopped hoping something would happen between them, and the guy is constantlyflirting with her. What makes someone act like this?

Yeah I date around when I don't get the girl I want and hope one day she becomes available.
No I move on from rejection and don't cling to the past.
This has never happened to me
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Do men just date around when the woman they want is not available at that moment?
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