What does it mean when a guy doesn't keep eye contact when talking?

dsunday
He'll glance occasionally at my face but will focus on something else when having a conversation like a chair, the wall, etc for most of the conversation. He's obviously paying attention because he can recall what I tell him and answer my questions. He just doesn't make too much eye contact with me. What could it mean?
What does it mean when a guy doesn't keep eye contact when talking?
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