Once again C. Take time to cool down and relax. You dont want to make any rash decisions that can hurt your case.
This is your WAW's problem NOT yours. She IS in a FOG or has been abducted by aliens, etc. She is living in a fantasy world filled with lies and justifications. This totally explains how she has been acting. Why she kept blaming you for the past so she could be JUSTIFIED in cheating. Regardless, YOU have to REALLY think if this is the END for you or NOT. I always thought infidelity was the END for me too, but after experiencing it I can tell you that the FEELINGS DONT go away. Think of your boys. Think of how good it could be if she wakes up once YOU pop her "fantasy bubble" that she has been floating around in. Just take time to really think about all this for the next couple weeks before you make any quick decisions.
She still has feelings for you which is the sick part. Or else she wouldnt want ANYTHING to do with you. Regardless, of the sick power/control games she has been playing. Because of these feelings she might wake up once she knows that you know and faces the repercussions for her actions.
That is why you need to really think about what you want and what is best for you and your family.
And Yes. I read her letter. And I had read similiar messages from my X. It hurt like Hell, but over time those feelings will turn from hate into pity. How sad it is that she had to go this far to deal with her feelings of being hurt. How she must have felt so trapped and hurt to resort to such measures. You have said how you hurt her in the past. She just chose the wrong way to handle this pain. Eye for an eye is obviously not the way. So once again. Are you going to choose "eye from an eye" or just feel bad for her and take care of yourself and the boys.
Like I mentioned in my previous post. I would gather your evidence. I would file for D and get a custody agreement in place. You can always stop these proceedings. She might come to her senses and realize what she has been doing.
You have a lot of history together. 2 beautiful boys and a long life left. Dont let these last couple years change your families future.