Why didn’t my coworker (and crush) follow me back on instagram?

A male coworker of mine (and also my crush) is giving me all the signs he likes me (mirroring, always standing in my personal space, checking me out from head to toe, makes jokes - only with me, other coworkers think he is way to serious, holds eye contact with me even when he’s talking to other people), and the thing is all these things made me like him, i didn’t even like him at first. So i followed him on instagram but he didn’t follow me back. Can anybody tell me why? Is he just playing games or is he too shy or what? I really don’t understand. His profile is public and he regularly posts stories, but he never followed me back. My acc is also public.

Why didn’t my coworker (and crush) follow me back on instagram?
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