Sorry; I forgot you had already confirmed she's still hot-and-heavy with OM. In that case, whenever she says the "we're just friends" thing, you should have put your hand up and said "Please stop it. We both know you're lying to me right now, and it's incredibly disrespectful to me, our marriage and our family." If she continues to lie, say "This conversation's over. When you're ready to talk to me from a place of truthfulness, we can talk some more. I'm going to _______ (some GAL activity)." And leave.
