Why would a guy act like he doesn't see/care about you when your near him but constantly search for or watch you from afar?

For context we work together, he knows I like him, I've told him this before, but now he acts different when he's directly around me, like I feel as if he's almost ignoring or avoiding me intentionally up until the moment I'm talking to someone else or I'm preoccupied with work or he thinks that I can't ‘see' Him. that's when I catching him looking at me or stealing glances, he even peeks to see if I'm still in my car in the parking lot while walking out to his own vehicle. All this effort yet he won't go out of his way to talk to me? Or even say if he feels the same way I do? Like I know he's shy with me but seriously how can someone be ‘this' shy? Especially when he's super outgoing with everyone else at work so why do I have to get this awkward version of him every time we're around each other?

Why would a guy act like he doesn't see/care about you when your near him but constantly search for or watch you from afar?
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