How do some men play hard to get--or try to get a woman to think he is in demand by other women?

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Just realized no one really answered the question, just answered why men would do this.
If you haven’t answered or want to add an answer, please answer HOW men play hard to get, or make themselves look like they are popular with other women.
How do some men play hard to get--or try to get a woman to think he is in demand by other women?
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