Actually as just a friend the flawed choices he keeps making in his life with no desire to change is really none of your concern....chances are he wouldn't listen to a word you say in the first place since he seems so caught up in his flawed life style...happy or not....& anyone wether they choose to stay given they know the situation or not have a RIGHT to react to the situation they are in. It has nothing to do with empathy or not when one only uses their emotional mind rather than their logical mind or neither would be in the situation they are in...he's asking to be treated badly by the choices he is making whether it be from wife or other woman he's chosen to be involved with. When you play with fire you are going to get burnt....& until there is a desire to stop getting burnt change usually isn't their choice.