Yes, sorry, didn't mean to give you a broadside. I congratulate you on being open minded enough to try and learn about the subject.
But the question of "Why didn't he tell me"...answers itself when you start to understand more. It becomes really very obvious and the sad thing is that a lot of people don't tell BECAUSE they love their wives and are frightened of loosing them. Yet the first accusation from wives, after being gay, is that they are deceitful liars.
If you had a secret that could destroy your marriage, career, friendships, family....would you tell anyone?