Why did he ask me personal questions like how my relationship with my parents is?

This coworker who has a girlfriend asks me very personal things and has been doing this since we met.

first he asked how I feel about a boss

later asked if I’m straight. I ignored and he asked again right away until I answered. wtf

he also asked me later on how my relationship with my parents is. Totally randomly.

he seriously asks personal questions randomly. Why?

Why did he ask me personal questions like how my relationship with my parents is?
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