I agree with you Hope. Once in deep enough, they can't seem to find a way out. Obviously, SOMEONE gets hurt. My H also feels bad about ow's D/ especially the effects of the D on her kids. Yah.. they are the "night in shining armor" for the ow.
I know my H has "tried" to end it with ow numerous times and I've seen some of her pathetic texts to him. "I'm not doing very well with this" "I need you to tell me in person that it's over" "If we walk away now, we will never know how happy we could be together", etc...
By the way Hope, your H will regret his decision for the rest of his life.