LG,
The only thing that I can tell you is that my H has been in an A. When I discovered it I decided to use DR before anything else. He denies her existence every time I ask but have found some texts when he forgets to delete them.
He also told me a year ago, what you mention, and said he was not sure if he wanted to continue ... I have been really doing what MW recommends and I have changed for the better and so has he, he still gets some texts but now he doesn't tell me that he wants space... we have been closer than before, spending a lot of time together, vacations. My M has been a lot better than before.I don know if they have seen lately but she still texts him saying that he misses him. My guess is that things have changed and OW is pushing him. We went on vacations last week and had a great time together.It doesn't mean that everything is great but we have reconnected and found that being together is fun. I feel it's a start!
I know that actions speak louder than words so I would tell you read and apply what Michele recommends, so far it has worked for me. I have been married 28, almost 29 yrs D26, S22.