Shy coworker into me or not?

So I started liking a coworker a couple months back that we have a mutual friend with. She is considered extremely quiet and timid by everyone. She asked for my number but it never went anywhere. I text her once in awhile but it takes like an hour to get a response back. She would always mention other guys she texts when I text her. It just made me really confused. She has said she with someone but doesn’t love him but her profile says single
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She never texts me first is what really pisses me off
Shy coworker into me or not?
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