Why did he follow the people I've tagged on my profile?

My crush attends the same courses at uni as me. I checked his Insta profile and he doesn't follow many guys from uni. He's from a foreign country and follows only people from there and in general he hasn't socialized with us, the locals at uni. I decided to make a follow request on his Insta profile and he accepted and followed me back, which is very natural and anyone would do it... However, short after that I noticed that he also followed 2 friends of mine from uni. These are the only people I've tagged on my profile and he has never talked to them.

So you think he's interested in me? He's in our university's group chat, but he doesn't follow anyone from there. How come he follow my buddies?

Why did he follow the people I've tagged on my profile?
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