Same I spent months trying to rationalise with my H. Only to be told by a mutual friend that although my H could see the logic in what I was saying he wasn't feeling it and was indifferent. It was shortly after that that I found DB and started LRT.
Today I just want to shake him, tell him that he's being an a**e and to just come home! So frustrating.
Thanks for the story about your friend's parents - perhaps it's never too late then?