What is his motive?

I am quite bothered in a weird way because one guy in my class session I noticed he would always turn completely around when I walk in the room to say hi and transfer his conversation over to me. If he’s talking to me and someone else walks in the room he wouldn’t even glance at the door till it’s our professor.

I didn’t think anything of it till he followed me on Instagram which he had to lurk on my college profile in order to find it. He didn’t like any pictures so I assumed I’ll check my Instagram story. He watches every one faithfully and an hour before class starts today he unfollowed me? What the heck was that?
What is his motive?
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