What are some reasons that a guy would always look away quickly when you look at him?

I know in some cases it means he is checking you out and does not want to get caught, but are there other reasons? There is a guy I work with that does this a lot. If I look at him he jerks his head in another direction. Or if he walks into the room and he sees me he will look away quickly. This happens a lot. We talk often and he is super friendly, but he has also mentioned he does not want to date so I’m confused by this behavior.

What are some reasons that a guy would always look away quickly when you look at him?
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