<<since we all think we were at some point responsible for the actions of our spouses or co-responsible.>> I never bought that line...maybe I should have my own website!
You know my opinion on what most of our spouses did. As far as boundaries go, I am surprised at how wide they are for most people on this site. We all have our reasons ... he /she is a good father / mother....the kids....etc etc etc.
Bottom line is that I agree with what the book you are reading says. It was THEIR choice to commit those indiscretions and they will have to live with it. The only problem is something tells me that most if not all of the WASs have all this tucked away somewhere in the back of their minds right next to the file filled with excuses on why they acted this way. "It happened, it's over and I refuse to talk about it." My final concern is the degree of recidivism....but hey, we don't know what the future holds for any of us let alone a future relationship....choose to BE HAPPY!