Thanks so much for posting this! It really helped me to understand!
My H started out friends with OW, and he crossed that line. I have questioned myself many times about the "why". He crossed the line without knowing and slipped in where he didn't think he could come back from it!
Well, now I think he realizes and is trying to cross back over to my side of the line!
Thank you so much, I needed to hear this! Perfect timing!