Do I have a right to be suspicious?

My boyfriend has this “friend” that he occasionally talks to. It’s the wife of one of his friends he doesn’t really talk to anymore. Well, he recently just made a Facebook again. He adds her and she doesn’t even like his profile picture which is of him, me and my daughter, doesn’t like the pregnancy announcement which has me , him and my daughter in it as well and she just likes the ultrasound picture he posted of our child...no big deal, right? BUT she goes and HEART reacts to the pictures of just him on his birthday. Something doesn’t sit right with me.

Would anyone else find this weird and would you feel like something was up?

EDIT: This chick has never even met me. Not one single time. We have never even spoken to one another.

I feel like she has this weird crush on him even though she’s married...