Why do some guys pull away and come back after a while?

This question has been posted a thousand times, but I still can't get why guys pull away and then come back? (not everyone). My experience has shown me that every single guy that pulled away, eventually contacted me again.

Please guys, do explain this to me? (Only guys who do this. The ones who do not behave this way, shouldn't answert but).
Why do some guys pull away and come back after a while?
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