How to break off communication without starting a fight

So after months of BS, I've said all I have to say, proven my point, shown her I've made huge strides and personal change through hard work and being honest with myself, and left her with it. She's not moving forward or working on her, let alone us, so I'm done. Not filing yet mainly due to legal/financial reasons... have professionals working on it though, but because of complications due to my "wife" owning shares in my company I need everything in place first. She doesn't want a D anyways.... The problem is, since she won't be part of making a decision on us... she keeps communication open. I don't know how to tell her to stop calling me to "chat" without it turning into a "screw you" or something that COULD damage chance for R in the future IF she comes around and starts back working on her own problems. I don't want it to be an ultimatum either. Any suggestions? I feel like every time we talk I go back into a tailspin and it takes me a week to get back out of it. Especially since she's still having an EA (her words) with this group of friends and her girlfriend+family

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