Since you've been talking to OW, why don't you let her know you and your husband are still sleeping together. She might be interested in seeing some of the love poems he's written lately as well.
Chances are pretty good he hasn't been completely honest with OW, either, and this may cause some tension over at her place...
This is EXCELLENT advice. I have seen this work with women, especially!!!
Use the adulterers' paranoia and deceit AGAINST them.