Is this weird?

Bear with me, since my boyfriend ended things with his ex, they haven't been on speaking terms. She's tried to reach out to him a few times saying that she's sorry and she wants to be with him and he has always let me know. Keep in mind that she has a boyfriend now and since she has reached out. She's always watching us when we're together and sometimes asks one or both of us questions. We also had a class together last year so I'd see her for at least an hour a day. I'd catch her all the time just watching me because I look around the room at people who answer questions. Well I just got a follow request from this girls boyfriend on Instagram when we never speak and he never speaks to my boyfriend unless they have to.

Like there's no way he didn't know it was me. Is he trying to keep tabs on my for his girlfriend? I mean I'm pretty positive I shouldn't accept it, it's weird right?

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