AS, Sorry to hear the state of your situation. In my wife's EA, she would make comments about what a great father the OM was to his kids, and the two would spend a lot of time talking on the phone about being proud parents etc.. Funny thing is, when I finally contacted his wife, one of her chief complaints was that he wasn't being a good father and was hardly home! Interesting how the rose colored glasses of the affair don't let any faults come through to the eyes of the waywards! They show and tell each other exactly what they think the other wants to hear.
I guess I'm trying to say that sooner or later, she will see his faults. Perhaps she will even let herself remember that you were, in fact, a good dad.
You are living your own truth. Your kids will always know the truth. Stay the course, one day this woman may be your wife again....