Well done, Sketcher. I found the no-contact rule worked very well for me. Occassionally, my xab would catch me off-guard and I'd unknowingly answer the phone. All it took was a few minutes of talking to him to see that his life was still filled with chaos, and that was something I did not want to invite back into my life.
So I'd wish him well and end the conversation in under five minutes. These days, he rarely calls me. Not because he doesn't want to, but because his efforts to keep me involved proved fruitless.