He was obviously dumped by the woman, who has more common sense than he does right now. He'll wake up in a few weeks or months and go, "what the hell did I just do?" But as of now, he is still immersed in the psychosis of mad love.
I don't think the gal pals of Clinton or Edwards were ever anything more than pleasant vanities and erotic vessels. I get the feeling that Ensign is a creepy power addict and bonking his aide's wife was just a way of asserting his alpha status, his right to humiliate the men who serve him.
This guy, on the other hand, seems to have gone over the moon. His inner self at war with his stated convictions. He's like the professor in "The Blue Angel," desperate to give up all that he earned just to be a clown in his beloved's circus.
Have you been there yourself, John? Have any of you?