Just my opinion (worth what you paid for it), but I view your W's anger as a good thing because if she did not care, she would have no reason to get angry. The old saying is the opposite of love is not anger, it's indifference.
Are the reasons she is angry valid? If so, make those changes (you may already have). If not, they are most likely from the script.
Also, how has she handled anger before? Is she an internalizer or someone who let it out pretty quickly once she was upset? Does she hold grudges?
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Every time I hear her talk and the anger and resentment comes out louder and clearer, it just seems to me she entrenches more in her decision.
You don't know what she is thinking. You are mind reading. Don't do it. If your W is like mine, she really does not understand what is going on with herself. How should you be able to figure it out then? You can't.
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When she negates any of the positive that has happened in the past 4 months (or 6 years) by saying she was just putting on a good face makes me really question what I am doing.
SHE cannot negate any positives in YOU. And that's all that really matters. And, you guessed it, more script. Everything that is wrong with her right now is YOUR fault. B/c it makes her decision to leave easier and she will fell less guilt. This is a HER issue. Let it go and focus on you. Are YOU happy with YOU right now? That's is the only issue.
You can dothis. Just take a deep breath and hang in there. It's gonna be a long and bumpy ride.