I haven't been around much lately. I'm in Florida for several weeks. Getting on with my new life. Lovin' it!
First off - congrats on your promotion. That is a real honour and you have every right to feel very proud. And also congrats that things continue to go well with Gym Woman.
I have one of the nuttier exes too (you know that). When I finally stopped communicating with him about garbage (like what he wanted all the time despite court orders etc) I took myself out of the drama. Yes her behaviour is nuts. So is my ex's. But finally I decided to say "yes - he IS nuts. yes - he is not the guy I married. Yes this all sucks that I'm paying the price for his idiocy. yes it sucks that I single parent with no help" but this is the way it is. And I choose to stay out of the drama and deal with what is in front of me.
Try to keep it in perspective. Go sign the paper. Put your son out of his drama. Be the bigger person. It always works. Ignore her. Pretend her assinine behaviour has no effect on you. And think of it as in my situation. Mine involved medical drama. Often. Ambulances. Seizures. E.R. visits. Hospitalization. No what? he doesn't even know most of the time. Because he would just add to the drama. And should I have to do this all by myself? NO! Should he help? YES! But all he concerns himself with is "why can't I see Ryan next week when I had a late meeting on visitation night this week?" Ok - frankly - I don't give a damn that he had a meeting.
Ok - just illustrating that you CAN take yourself out of the drama. And you don't need to keep saying - "she's nutty, isn't she" Yep - she's nutty. But I think she thrives on the drama. So stop adding fuel to her fire. She will fizzle. Mine did. Now its just little flickers once in a while but so minor I just stomp them out. And you can do that too. Takes time. Takes patience. But you can do it.