At work he stares at me intensely across the room while im talking to someone?

So me and this guy work 2 different departments in a casino but when he’s at his work station he will give me this intense stare while I’m talking to someone across the room… I will look at him and he will not pull away… we talk here and there but it’s very small talk…. He’s done this a couple times now…. What does this mean? He’s not smiling but just a very intense stare at me from across the room and it’s always when I’m talking to someone

At work he stares at me intensely across the room while im talking to someone?
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