Male Coworker denied my friend request , Why? & How do I handle the “awkwardness” at work?

I started this new job in December. Most of my coworkers are nice and friendly, so I decided to add some on Facebook. There’s this male coworker at my work who is always looking at me. We always had small conversations but never really talked. We rotate in sections at my job so most of the time when I’m at a spot where he knows one of the coworkers I’m working with , he would come over and talk to them and just always glance at me and smile. It confuses me because I feel like he’s kind of flirting with me or attempting to have a conversation with me. When I tried to add him on Facebook yesterday he simply denied it. And I feel completely embarrassed and stupid because I feel like the shit he was doing was just in my head. Anyways, how do I act normal at work? And what do you think he didn’t accept my friend request? And yes he’s active on it.
Male Coworker denied my friend request , Why? & How do I handle the “awkwardness” at work?
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