Dear CL, it is obvious that we are polar opposites and I hesitate to make suggestions but I do feel that your wife is goading you and willing you to show some emotion to your situation.
As a woman I would see your inaction and carefully chosen and well thought out words and actions to show a lack of passion/ love for our marriage or me, totally passive-aggressive,given what I was doing.
Maybe a 180 for you would be to show some anger (righteous indignation) words spoke straight from the heart having bypassed the brain and all the annalitcal(sp) thinking.
I feel you are such a gentle man,who will avoid conflict at any price and you are loyal to a fault.
Sometimes a woman needs a man with a capital M, I think this is what your wife wants from you.
Now is maybe the time for less thinking and more alpha male action. It has been too long and this is a marriage of convenience not a marriage of two hearts.
You come across again apologies if I am wrong as self sufficient with little room for a wife or love or passion. Like your dancing,you master and perfect the steps and routine with a compelling dedication but what is your facial expression telling your partner. Dancing is not just steps it is feeling an outward display of the moods and passions in your soul.
I do believe you love your wife in your own way but she needs to feel that.
Good luck.