I have no interest in whether he is straight or gay. It's completely acceptable to be gay nowadays, and quite rightly so. He may or may not have had an affair and I will assume for now that he hasn't.
When sexuality and faithfulness is taken out of the situation we are just left with a person who realises he has married the wrong person and stayed with them for many years knowing it. There are many, many, many people who do that every day, often staying together for the sake of their children. So I don't see why his case is any different, or why it deserves so much attention.
Also... Surprised not!