TBH, I'm not sure it would change much for me if I verified that she is a definite OW or that there were others. It would probably just tell me that my H, despite his claims to the contrary, hasn't changed a bit and that he is still lying to himself and to everyone who cares about him including the OW. We don't do family time now anyway so I'm not worried about cake eating. Anyway... when he buys his new house and moves out and the kids have their first visit there, we will have our answer. If she is living with him, we will know he has been lying all along. At that point, I will definitely stop by his place to introduce myself and let her know that if she is interested in the truth of what went on, I'd be happy to fill her in.