Ugh. What an a$$! I think it is a blessing that he is a vanisher. The less exposure you and your son have to that kind of negative energy, the better. Your story about the cheese fries is not stupid. It is a great example of the kind of narcissistic personality you were/are dealing with.
I agree with you about getting the finances in order ASAP. In my sitch, XH wanted everything settled within months of him moving out and while I didn’t want to, I knew that it would be in my best interest to do it and that when the hurt had faded, I would be glad that I did. A lot of LBS’s seem to believe that if they stall and put it off, they have a better chance of saving the marriage. I think if the WAS has gotten to the point of offering settlements, they have genuinely made up their mind and efforts to stall are only delaying the inevitable. XH offered me a really good deal and I knew that I would be an idiot not to sign on the dotted line. Two years later...I am so happy that I did. It is way easier to heal when you aren’t dealing with conflicts over property and money. I am crossing my fingers for you that he signs and you can get on with your life. (((HUGS)))