Why is he smiling to himself after he looks at me but doesn't talk to me?

Anonymous
why is it whenever i talk to this guy at work he stares at me and turns away and smiles to himself. i am feeling really self conscious about it cause i dont get why he laughs and smiles to himself and sometimes to me out of the blue? but the thing is he hardly talks to me - just very briefly - so now i am even more confused?
Why is he smiling to himself after he looks at me but doesn't talk to me?
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