Why do men develop serious crushes on total strangers they know nothing about?

Anonymous

A neighbor of mine I've never spoken to always watches me when I leave the house, tries to make me notice him by "accidentally" running into me and talks about me with his friends. He has been doing this for 2 years now and I have never smiled at him or given him any attention. He is not unattractive at all and he seems like a likeable person so why is he acting so "desperate" instead of dating someone else or approaching me?

Why do men develop serious crushes on total strangers they know nothing about?
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