husband - Funny, I was thinking the exact same thing in my situation. I am growing weary of the disrespect that comes with a wife who cheats. She has no regard for me at all, and I am prepared to have the last-last-resort discussion with her. It's time for her to $hit or get off the pot. However, I am torn. I do not want to be the one who "gave up." But she is making it very difficult to hang on.
Wife is showing no signs of either drifting away from her boyfriend or toward me. And, like you, I am prepared to leak the secret to the family and friends.
And if we get a divorce, I will indeed tell our kids; IMO they are entitled to know what she did to destroy their family.