Quote: I've managed to keep calm, cool and unflustered as she acts out her playlet.
HER playlet... Yes. Good for you for recognizing that. It's HER drama, HER insecurities. It just sucks that it's at your expense, and that of your marriage and family. The the key to surviving is not to be sucked into her drama, but let her play it out by herself and avoid adding fuel to the fire. Also, it is important to recognize that the breakdown of a marriage is the responsibility of both parties. You helped. Own that, change the things you did to contribute, and move on.