Remorsefulness isn't an automatic when the A ends. I remember telling my H something similar to what your W said, which didn't mean a thing to him b/c he could tell I was not sorry about my involvement with OM. It took me a really long time before I could tell him I was sorry.....and I was actually praying that I would feel remorseful b/c I knew it was necessary in order to get back to being "me" again. I couldn't get my heart right with the Lord or get my feelings back for my H until I was sorry for what I had done. That may sound strange to some people, but that is my personal belief.
I only tell you this b/c I have wondered how long a person could go feeling no remorse.... when they didn't have the guidance/support (DB Board) that was given to me. If they continue to live their wayward lifestyle and don't wish to R the M, they will be looking for the next A.
Piecing is hard, and I don't know how it is even possible if the WAS is not remorseful and the LBS is not forgiving. That is not to say that some WAW's who have been in an A won't agree to go back to the LBH. And many men are so focused on just getting the W back, they overlook the fact she does not feel sorry for cheating on him.
I hope this C can help your W.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!