IF...you are with a very remorseful partner who is not NPD of BPD etc., it could be ok.
My MC failed to believe me when I said there was and continued to be an A...IT WILL NOT WORK WITH AN EMOTIONALLY UNAVAILABLE PARTNER. Once I proved the A was a go still, she apologized and said she noticed he wasnt emotionally charged but was hoping it was just his personality etc. and that eventually my hurt would awaken something.
I honestly dont think it will be helpful until you have made some progress on the A and it is dependent on your partner...I also was directed to Codependant No More and Boundaries...If those are truly issues withing the marriage, unless the partner fixes themselves, we arent really safe being connected like that, which makes it confusing and difficult.
Dont know if that helped, but its my 2 cents on it.