I'm doing my internship for my degree, have 3 months left.

I've been moonlighting and running an online sugar dating business (match sugar daddies to sugar babies). I'm just minding my own business, doing my minimal work for my boss and maintaining good relations with the staff.

This nosy coworker (also an intern, joined later than me) loves to peek at my screen(s) and observes what I'm doing all day long.

He's been confronting me about it whenever both of us are alone. He even mentioned he registered an account there.

I'm just trying my best to ignore him. I'm afraid he reports it to the boss & gets me fired. I live in Asia, where sugar dating is still taboo.

What can I do to protect myself and make him fuck off? Should I start recording all conversations all day long?