Listening to the show memories flooded back. Only a few years out of a relationship just like Karen's. It starts so slowly you don't realize what is happening. Amazingly enough he still tries to bully me. My advice to Karen is to RRRRUUUUNNNNNNNNN! No therapy will fix the narcissistic behavior. No therapy will stop the cheating. I'm sure he has cheated many more times than he was willing to admit on tv.
Get therapy for yourself Karen and remember Dr. Phil was right. It is not about you. He is trying to make himself look or feel better and unless he is ever willing to admit it there is no hope. Your children do not deserve to grow up thinking that this is how marraige should be. That is my biggest regret. My children were almost grown when I got out. I pray that they will see him for what he is.