Why does he stare at me with annoyed gaze but act polite when I approach him?

Anonymous

A coworker sometimes gives me long annoyed stares and does not look away when I catch him staring. However he is very polite and sometimes friendly when I approach him. I feel like he dislikes me however I noticed that he sits very close to me and leans in a bit too much during conversations so he can't hate me that much.

Why does he behave like this? Did I do anything to offend him? I can't ask him directly because he is very non confrontational

Why does he stare at me with annoyed gaze but act polite when I approach him?
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