Read this on another thread, and couldn’t believe how succinctly it described my exact situation.

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It starts out with her threatening a divorce when you confront her about her inappropriate behavior. Instead of her apologizing and correcting it, she throws up the D card. How serious she is........nobody knows, but I can tell you that once she starts threatening, it will weigh on her mind more & more. The fact that she blames you for everything, says she doesn't take responsibility for her part in this situation, IMHO. Maybe some of that comes from not being held accountable when she was growing up, or after she became an adult. Perhaps you are the only one she sees to blame, depending on how small her world has become.