Do not trust her as yet. She will succumb. for all intents and purposes she is a drug addict, addicted to the chemical release in her brain that her infactuation causes. Expect her to fail, it is normal for them to fail, she could fail several times, she will be unable to help herself, until her brain resets.
Honestly, try thinking of her as a drug addict or an alcoholic. In any case, you have to walk your path forward and I do not mean filing. Filing will do nothing for you, it might give you a short term satisfaction, but that will wear off fast. You have to carry on improving yourself, being the best man you can be.
Your wife might be starting to feel the pain of ruining your relationship, but ATM the her pain of losing her beau trumps that pain. And that will remain so for at least a month or two.
Give it time. Do not throw in the towel on the first set-back, and setbacks there will be.
