Looking at the papers will do that to you. I read mine carefully once - and then locked them away. I'm confident I did the right thing in regards to the divorce, bu wow, the day the child custody papers came through for me to sign, it gutted my heart to even see my children's names and ages listed in cold legalese.
As for STBX's new gf.... She may not be his new girlfriend, but even if she isn't, you need to be mentally prepared for this. From everything that you have written about your STBX, he sounds like he is ready to move on, probably sooner than later, and probably with more than one unlucky lady. I doubt anything will last very long - at least not at first.
You know all of this, and I'm confident tomorrow, you will dust yourself off and move forward.
You know what I see as a huge positive in your situation? That making a permanent home would give you so much happiness. Because I know, Maybell, that you will accomplish this. Yes, you may have to rent for a year. But you will get there. Time to start that Pinterest board about the dream home you are working towards.