Do you think my boyfriend's ex is messing with me?

Hello everyone! So, my boyfriend and I have been dating for two years now. He used to have a situationship with a girl on our friend group. I am not close to her, but we are obliged to make small talk with each other since our friend circle is the same. I don't hold a grudge against her, but something a friend of mine pointed out really confused me.

My friend asked me if my boyfriend's ex and I follow each other on social media. I told her that we do follow each other, and that she even likes the stories of me and my boyfriend. Later on, me an my friend realised that the ex only likes my stories if my boyfriend is in them. My friend told me that it was odd, but I do not know how to feel. Do you think I should be concerned about this?

Do you think my boyfriend's ex is messing with me?
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