You can say, as long as you're with OM, I choose not to be with you. I will shop for D on my own this year.
You could add that it's too difficult or painful but it's not necessary.
I can't imagine what your weekend was like. Take care of yourself, you have a D to focus on.
Try not to get too wrapped up in what she's saying, although it's near impossible. Emotions change constantly, that's why you hear so much here about sitting with things or riding out the emotion before making decisions.
You could also tell her that you want NC other than things that have to do with D. You can also let her know how you want to have that contact, text only, etc.
You do NC to protect you, this is not to teach her a lesson or wake her up. This is to allow you to begin to heal.
Give yourself that time.
Me 57/H 58 M36 S 2.5yrs R 12/13
Let me give up the need to know why things happen as they do. I will never know and constant wondering is constant suffering. Caroline Myss