Situation is shitty op. Let me share what I think, cause I think I am smart guy and my two cents may be what you need right now.

First, I will have advice on how to proceed, but it does not account for legal situation, so consult a lawyer once you make up your mind and make sure you know the risks your course of action introduces.

Now. Let's talk about your relationship, your emotions and feelings. You've been hurt, your trust was abused. I may have something to say about "the other side of the coin", but whatever I say later, primarily your wife has done very wrong to you. It's neither expected nor smart to consider you have relationship like you had with her anymore. In fact you should perceive her as a hostile person, I mean, I lack vocabulary in English... a person that is not beneficial to you, who should be avoided, who brings bad feelings. Not a person that is harming you intentionally. So the right way to interact with such person is not to interact, minimize interaction below neutral level even. Avoid contact. When in contact, avoid negative feelings and generally any emotional display. She's a nuisance.

With a person that has done something like that, you're a fool to put direct effort into salvaging anything. And since she's shown her weak character, lack of spiritual strength, she's likely to misinterpret anything you do as weakness. Even slightest hint that you would like things to go back the way they were is sending a message that you can let huge harm be done to you slide.

So let me make a point of that: you're not letting it slide.