I have a coworker, that when we make eye contact he shakes his head and looks down. What does that mean?

It feels like he's actively making a point to avoid looking at me/talking to me most times, other times he makes such hard eye contact at feels intense. When I smile at him and say hello and try to start a conversation, he will return the greeting, but shake his head and look down and away, keeping the conversation minimal. He looks from afar sometimes too. I can't figure out if he likes me, or is annoyed by me

I have a coworker, that when we make eye contact he shakes his head and looks down. What does that mean?
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