You got the perfect attitude for saving your marriage and yourself.
I'm glad she is reading the book. Make sure she reads the whole thing and not just HER part. I did that at first with that book. I tended to focus on the things that my fogged out brain wanted to hear and twisted it....tried to find the thing that would make it ok to leave and justify the affair and a divorce.
In my opinion now, there is never a good justification for a divorce unless one person has no control over it (someone divorces YOU), there was never love in the first place (but then how do you explain marrying the person many years ago), or abuse.