Why do men come back after a period of no contact?

There was this guy I dated, we met 3 times, he seemed to be into me (but at the same time he had just ended a long relationship and had "broken heart") and then he pulled away saying he has a lot going on. Now, 3 months later, he messaged me to "simply ask how I'm doing".

Why do men come back after a period of no contact?
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