Dawn - I am in Australia. I think your idea of detaching is a real good one.
I am going to try and get the marriage to work however if it doesn't and I have to accept that I cannot control this how do you move on ? Are their classes / courses ? In the course of living your life when do you open up to the opportunity of choosing another partner ?
I think that the best way for me to deal with this is to look for what is next - this may help me get through the whole thing plus maybe my wife will come to her senses while I am working on myself and letting her go.
As a side point has everyone who has been through this feel they improved on themselves. I personally feel like this is going to change me significantly - even though it is hell I hope I can grow as a person.