I wanted to check in on you and see how things went. It seems that W isn't totally shut down or shut fof from you. That is a positive.
When you go to MC, I would sit and listen more with EARS more than your mouth. If you need to speak, state that you would have done things differently and you've done some reflection over the past several weeks/months. State that the past has passed and you guys cannot get them back; HOWEVER, you are determined to start a new and one of the most important goals in your LIFE right now is to get it back on track by attaining the soberity pin.
If you cannot get your life in order now, then you will not be able to be there emotionally, mentally, and spritually for a stronger M as a healthy person.
State that you are sincerely sorry for the pain you've caused her and are very determined to make it right for everyone....espcially for W. You are focused on more positivity in your life and saying good bye to negativity. Your outlook is more positive and brighter.
It's okay to say to W that you were an idiot and that you're kicking the villiage idiot's ass out!