What is the reason a man would be very curious about a particular woman?

I'm confused. Not sure how to ask this question properly but let's just say that you are dealing with a player. You were never in a relationship and you no longer give him attention/ give up the goods (lol) yet he is still up your a$$ and seems to be very curious about you; maybe even unfulfilled without you/ disappointed about how the connection turned out. Also, there is little to no communication between the two.
What is the reason a man would be very curious about a particular woman?
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