He contacts you the whole day and then ignores you for a few and then contacts you again. Why?

He's (M 25) not the first one who ever done that to me (F21) but it's too annoying... Why do some guys do that? Like texting you the whole day or calling with you for hours and the next day they just stop replying for a few days and then contacts you again?

He contacts you the whole day and then ignores you for a few and then contacts you again. Why?
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