Girl is liking and/or commenting on every single status my boyfriend posts.

Anonymous
Pretty plain and simple. This girl keeps liking and commenting on (most) every single status my boyfriends posts on Facebook. We don't have it official on Facebook because we both think it's stupid, but it's pretty obvious we are together due to our posts and pictures. Is it irrational to get upset that this girl is acting like this?

I remember him telling me about her like a couple months ago, he said that she is some fat, goth chick that his friend is banging/dating. I'm worried that she is liking him or something. What do I do?
Updates
+1 y
Turns out she is one of his supervisors and they joke around a lot at work. He said that he is definitely not attracted to her and even thinks she might be lesbian (even though he thinks that she was hooking up with one of his friends). He treats her just like one of his bros, and thinks nothing of it. I still think it's weird that a supervisor is liking/commenting/posting things on his Facebook with such frequency.
Girl is liking and/or commenting on every single status my boyfriend posts.
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