Why would a man with a girlfriend look at me like he’s studying me when he asks about my life, he just seems way too interested as if I was a book?

Why is a male coworker who has a girlfriend so interested in me? He’s very outgoing with everyone however I keep pulling away and getting more quiet and trying to avoid him and he asked why I was mad at him but he’s not getting that I want to disconnect?

Why would a man with a girlfriend look at me like he’s studying me when he asks about my life, he just seems way too interested as if I was a book?
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