Why does this guy follow other girls in class on social media but not me?

For context, both him and I are 3rd year college students and we're in the same Class. I've had positive encounters with him in the past and he has initiated a brief convo with me once, but we never really had a full on convo after that, it's always kinda awkward or breif when we do. Like he's abit stiff and short with me if you know what I mean. He would greet me with a smile and often just greet if we make eye contact not too long ago, but he does so that anymore. Yet I come to find he follows a lot of girls in my class including my bestfriend whose also in our class, and he's spoke to these girls before and has no problem speaking to them comfortably. He's known my bestfriend since first year, but I find it stenage how he's only following her now and she and I have only also gotten close since like last year. He's also always polite towards me but that's about it. He has a girlfriend.

Why does this guy follow other girls in class on social media but not me?
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