Why does this coworker avoid eye contact with me?

I feel like he tries his best to avoid looking at me even though he is social and has no problems with holding eye contact with others. When he talks to me he makes no eye contact but smiles to himself since he is very friendly. He also only adressed me with my first and last name while calling everyone else by their first name, even new acquaintances. I feel like he tries to keep only me at a distance. Why? I never made advances at him

Why does this coworker avoid eye contact with me?
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