Different between guys playing hard to get vs not interested?

Please explain in detail the difference like behavior wise etc

Updates
1 y
Also meant to ask what it means like what’s the point of it?
1) the guy likes you and wants to mess with you psychologically so you like him back?
2) he doesn’t like you but wants attention?
3) he wants to use you
4) other ( please explain)
Different between guys playing hard to get vs not interested?
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