Why does he copy me?

I updated my status to, I love dark mode on every app. Next day I see everything in his computer is changed to dark mode - everything was stark white until then. I catch him sort of lurking around my cubicle and coming over to my side of the office floor for things he doesn't really need to. I mentioned hating cricket once and he never watched a game on the big screen again. I mean what's that about?
He also watches my face when I'm concentrating on the main speaker in meetings - the attention makes me uncomfortable.
I don't know guys, what do you think?
Why does he copy me?
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