Wow, you have had a rollercoaster ride this weekend. I'm sorry, that is a lot to handle.
Your H sounds confussed. And I agree he is trying to make himself look better by giving you a crumb of niceness. I know it is so hard (I failed at it for months), but the best thing for you is to let what he does roll of your back. I know that is way easier said then done. I too sent my H emails and text just like the one you sent your H. Then I would beat myself up for it, and also do the opposite of what I told my H I would do. Try as hard as you can to stay out of his drama, you will start to feel better.
You are the only one that can decide wether to sign those papers or not. If it is going to protect you then I would suggest doing it.
Together 16 years Married 12 years Me 36 H 34 D9 & S6 Separated 12/3/09 Confirmed A 1/25/10 Exposed A 1/26/10 H hired L, but not filed yet 1/27/10