Why do guys want you only when you don't want them?

It starts out the same: you won't be into a guy initially, and the guy will be into you and then you start liking him more and giving him more attention and then he backs off. You get to the point where you see he doesn't care so you back off and even start to lose feelings and then sometime in the future he will get back with you. What's going on in the guy's mind?
Why do guys want you only when you don't want them?
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