Why do guys go hot and cold?

Why is it that a guy will come on strong such as flirting and teasing but then backs off for a bit only to come on strong again? Is this something I did wrong or is this a game?
He's feeling strong feelings and it's scary so he backs off because he doesn't want to appear too eager.
He looses interest until it's on his terms. He wants to be chased.
He's not sure WHAT he feels. He's playing it cool until he decides he doesn't care enough to pretend and acts hot again. So the circle continues.
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Why do guys go hot and cold?
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