For my situation I agree with what Toots said, it's worth it to wait quietly for the feelings and relationship with OW to possibly dissipate. But if there is no OW then probably I would not wait as long, especially if WAS tends to be stubborn and unwilling to admit mistakes and might not come around in their own.
Another good reason to follow the NC path is when you need more time to grow and improve and/or they do too. Obvious things like overcoming addictions and getting your/their act together. Again in my case I think this applies as I don't want to be with my H as he is now. Time is needed.
Silent time can also give you the chance to get over the heartbreak and realize you don't really want them back actually. Yup, I think this might be my story.
I don't really see the above situations in your story but we don't know much about what is really going on with him...
