Am i being crazy?

I hate to admit, I’m a CONSTANT lurker. Anyway, should I be mad at this?

A few months ago my man was showing me something in his dms with another girl, while he was scrolling though the dms, I noticed her calling him baby. But those dms were months before me. BUT, I noted this girl and continued to keep tabs on her.

I realize a month or two ago, she unfollowed him but he had never unfollowed her. I noticed yesterday that she followed him again and commented on his post.

SHOULD I BE CONCERNED?? Should I ask about the girl or wait till he gives me a reason to ask about her.