You know my sitch and we've given each other pretty good advice so far. I'm going to say this as a WAW.
You have to STOP. You have to focus on you and your son only. You know her mind is all over the place so you can't listen to what she is saying. I know from my own thoughts that even as I say some of the things to my H about staying and working things through, that when it all calms down and I'm alone I can't help but keep asking 'do I really want to stay?' It's not that I'm lying when I'm with him or that I'm telling him what he wants to hear, I genuinely mean the things I say to him. BUT...we life slows down and I have a chance to take a look back over what was said and done, I keep faltering. That said, you have to focus on you. You have to make sure that you are strong enough, prepared, and confident in yourself for yourself for whatever life throws at you. Stop giving away your power...she doesn't deserve it.
It's scary, overwhelming and opposite from everything you want, but it is what you need to do right now. The only thing she has shown you consistently is that she is all over the place. You have the choice to keep riding her roller coaster or just to get off. It's time to get off.
And I don't see why you are sacrificing your car. I know it may seem like the nice thing to do but why. Why inconvenience yourself so she can run away? You are going for you, she has her reasons but you don't need to save her if she decides to jump ship.
Just my opinion. Doodi
"I feel like Rocky in the fifteenth round, beaten beyond recognition, when I realize, the only person I've been fighting for is...myself."