Wow, GBHost, you described my story to a 'T'! My WAW's mom passed away earlier this year, job duties doubled, health factors kicked in, then Bammo, affair started. You are also right regarding depression! I have no doubt she "thinks" she is happy when with him, but still miserable and racked with guilt other times. Anyway, I am going to print out your essay and re-read it for encouranegemt. I am also of course following DR advice on LRT and 180 hoping that she will eventually end it.
