But...I do understand the depths of dispair you are experiencing.
Don't let it suck you in. You are a MAN and you can do it! I love it that you are reading the Nice Guy book and you plan to implement changes for YOU.
I don't even know what to say about your wife any more. From everything you've written (and I know we only have one side of the story here but) it sounds to me like she needs a book like "How to soften up your inner beeotch". As "nice" as you are, she may be too rough around the edges to really be able to be a sweet and loving wife to you. Again, I don't want to insult her and I know she has her side of the story, but it just doesn't sound good to me. Do NOT take this as "advice"...I am just making a comment and trying to be supportive in a way that validates you and what you appear to be going through with her.