You/we can never understand how a spouse can just leave after x-amount of time. Don't even try.
I know you tried and you can't blame yourself for her actions. Be true to the person you have discovered you are and always strive to do the right thing. This is her choice and you can still show her the man you are by how you handle this.
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It was surreal to see the W v H on the complaint. I never ever thought I would be in an adversarial proceeding with my W.
It is something none of us had ever imagined. You always knew this was a possibility and now it is a reality. It doesn't change what you should do. Stand up for yourself and your principles, don't be mean or vindictive and show her what she is missing.
You know with time you will be okay. Hang in there and good luck.