I don't know that I'd send ANYTHING. The damage is done.
From my perspective, your options are:
Option 1
Start working today to better yourself and stop worrying about what your wife say or does, or how she acts
Work on the specific complaints she had about you
Learn to validate her feelings
Don't worry about what you feel your W's issues are - you cannot change them no matter how hard you try. You can only change yourself
Pay attention and look for positive results - it will happen slowly - this is a marathon, not a sprint
Option 2
Pretty much the opposite of the above
Continue doing what you are doing and continue getting the same results...
I'm sure there are other option that the veterans might suggest. If you feel you MUST respond, I would offer a heartfelt apology for your actions and words - keep it short and to the point, leaving your own feelings out of it.
