"She is a lonely, sad woman who found a man to bang her."

Wow. That's harsh. I don't find her lonely or sad at all. Well, lonely only in the sense that she doesn't have a huge social life outside of work. But that always seemed more like self-containment than unwanted solitude. She's also not very sad in the sense of being desperate or clingy. She is sad in the original sense of having been deceived and lied to for so long, and feeling that she has nowhere else to go but back home.

I don't think she wants to "bang him", to be honest. She must be wondering what other parts of their life together has been a lie, including the sex.