Why does this guy i'm seeing do this?

He's loving and all over me one minute, then the next he'll go very silent and just stare at nothing. It's as though he's in deep thought. I have asked of he's ok when he does it but he just says he is ok.

What could he possibly be thinking about and why go silent all of a sudden like that? It happens often

Why does this guy i'm seeing do this?
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