If ow is doing these things behind your H's back then he obviously had no idea of who she really was when they got together. He is certainly getting an education now. Whether he'll learn his lesson will remain to be seen.
You can pretty much figure that she's not in this for love, but for what she can take your H for.
As Grit said, protect yourself in all ways possible.
You've got some pretty powerful information. Take a little time to think about what to do with it and what the results could be from your choices.
