I just think you have to be careful, it seems too many people are thinking there is a textbook way to save the marriage. The only principles I believe in are biblical. Yes I use textbooks sometimes to give me different views and I choose what to believe and what to ignore based off of the teachings that I've learned. Trust me the way to save your marriage is through God. It starts with God and by bringing God to the forefront of your relationship you attract that person to God, not to you, but to God. Once they have that relationship, we can cleave to our spouse through him. I just hope that he reaches out to her, attract her through his actions and his relationhship with God. Once she sees these things she will come closer.
Close your eyes or go in a pitch black room and tell me what you can see around you. Not a thing, that's equivalent to living in darkness.
Open your eyes and turn on lights all around you and tell me what you can see. Everything, that's living in God who is our light.
If one person is following God and living in light they can help lead those to God through the light of the word. I say this not because I'm some religious person that thinks I'm perfect.
I say this because I was there, I know the other side, I know how it is to lose your wife, to lose your kids, your house, your family, your job, your friends. I lost it all within a matter of months.
I have my wife, my kids, a great job, a few houses, yet I still struggle to live in the light in a world filled with darkness. I just want others to know that the truth will be found by crying out to God and letting go of self.