Wow, John....I don't care HOW detached you are, to me hearing my kids talk about my spouses new 'friend' would/will be a kick to the gut.........
You showed a lot of strength and class to talk with your W anyway. I never picture you guys as being much older than me (in fact my son is only one year younger than your D), so to hear you talk about your W that way is surprising. Is she already trying to 'recapture her youth'?
Nice job going and caring for your D. And how great you are reading a book about being a great daddy. Your D will know how much you have loved and cared for her, and that is something in itself.