What are signs a shy guy likes you?

ayerithsky
I have a coworker that kind of gets my attention, we aren't friends and we rarely talk unless it is work related. I rarely work in his department, one time I was assigned there, he started flirting shamelessly with a girl who works there regularly, while I was sitting nearby, and then he announced his number loud enough for everyone at the station to hear. I've never seen him flirt with her when I've worked there before and they work together all the time. He is just being weird, unusually loud. he is usually quiet, based on the times I've been there.
What are signs a shy guy likes you?
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