Why would a guy you know use a fake account to reversely follow and unfollow you all the time?

A guy from my college made a fake account to watch my stories. He liked a pic of mine and then removed the like several months later. Rn he is following me but I’m sure he will unfollow again at some point. What could be a reason for this?
Why would a guy you know use a fake account to reversely follow and unfollow you all the time?
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