Absolutely NO CONTACT. This was something I read and it has been so helpful. It will allow you to start to heal and it is the one thing that will drive him crazy.
I am (STILL) married to a pathological liar. Here's what I do. First, never believe a word he says. I really don't care what words fall out of his face, in my mind, it's all rubbish. Second, I imagine a protective bubble around me when I feel threatened. It's sort of liek a "go to your happy place" kind of thing. I imagine a forcefield, anything negative or hurtful will just bounce off of me so there you go. Third, I pray. Not specifically about HIM, but if ANYONE sends negative thoughts towards me, I ask it be returned to them 10-fold. Might be a little silly, but hey, works for me!