Vye, I think most of us could agree that this is not the life we expected to live. After 30 years, I never thought my husband would go looking for someone else and leave me for her. After the shock and hysteria settled, I started taking care of me. Something I never did in my marriage. It was always all about him. I have two grown daughters, 23 and 28 who will not speak to their dad either. One day they may decide to have a relationship with him, or they may not. They are adults and will make that choice. My stbx has not accused me of turning them against him to me, but I am sure friends and family get an interesting story from him.
I hear you on the narcissist and compulsive liar bit. Sounds an awful lot like my own stbx. In my experience however, I have found the lies will get found out someday and people will side with you when they find out they may not come out and say it but they will think it and likely not take him as seriously. Hang in there. This site is a great support.