My husband is addicted to an emotional affair

[TrentC]

You can break their affair open. I'd present enough information to show that she's a "piece of ass" to your H. Even if you have to fabricate some.

This is a very bad idea. There is nothing to be gained from lying, even for the "best" of intentions.

If either of them figure out what you did, then you set your efforts back that much farther. Why would your H have any reason to come back to a woman who lies and manipulates?

It sounds like nicole's husband is still in contact with her and the OW doesn't like it. That should be enough to scuttle it in the long run.