answer:Yes, several times actually. One of those experiences was with a woman whom I considered the sister I never had. We were friends for several years. I loved her personality and humor. We shared the same values and perspective on reality. As time went on, I slowly came to realize (via a story too long to relate), that she was a clinically diagnosed pathological liar. She was also a chameleon, taking upon herself the colors of whomever she was around. She had told me many lies, yet she herself somehow believed them. How could I then trust a single thing she said? I began to doubt the authenticity of our entire friendship. I was shocked and so incredibly disappointed. I felt betrayed. I had lost what I considered a valued friend. I could not continue our friendship. Being lied to on a regular basis is a deal breaker, even if it is a disease. I let go fairly quickly, as I also became a touch angry. After that, I just accepted it and moved on. Such is life. I miss her, but I simply could not enable her forays into la la land.