Can a guy ever regain interest?

Standingpretty
If a guy loses interest in a girl, is it possible that he will like her again sometime later? Also, why would a guy invest months in a girl, call her by a nick name, admit that he liked her, then stop answering her messages and not call her back? Why do guys stop liking girls and how do you avoid it or regain interest? Thanks.
Can a guy ever regain interest?
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