Negotiating with an MLCr is much like a terrorist hostage situation. Seems most of what I have read and what I experienced is the MLCr will sacrifice the long term money for a short term gain. In my case she flipped the years we claim our son gaining probably 5-7k but let go of my 401k that I could not jump fast enough on.
I agree they get people in their heads ... but I suspect his threats are empty and in reaction to things now not going his way ... that whole applecart thing again ya know? I would just keep gathering information so you can go from there. Truth is I would have preferred the life I had, nice house in a great area and now I am going to a condo in an area I most likely would have not looked into but tbh I would not change it, these are my choices and its my new life and this is the direction I did not ask for but I will embrace it and be thankful for the lessons.
Hang in there, do the research so you are well armed with the information that will help you maneuver through this.