You did everything you could to repair your marriage and you did. But H has issues that you have no control over that are manifesting in his life.
And honestly, I dont buy that H is happy for one minute. He slapped a band-aid (OW) to try to minimize the feelings he was having. The way he is publicly trying to show everyone how great his life is, speaks volumes to me. Overcompensation at it's finest.
As I'm sure you know, this R is very likely to blow up.