Also, I find it very curious that the paperwork shows up today and, BAM, he is calling you to "resolve" this. Don't talk to him about it. He is trying to manipulate you into something that will only benefit him. That is evidenced by he statement about "disagreeing" on the amount. I have no doubt he got the papers and he has begun to try to what he alawys does...manipulate you into doing what he wants.
YES YES YES YES a THOUSAND times yes. Now is the WORST possible time to consider reconsidering. The past makes him think he can throw you a bone and go right back to business as usual. But you are the new and improving Mystik who is not going to let that happen! And when he realizes that you are not going to let that happen, he is going to be caught off guard. And yeah, probably a little ticked ... but also a little intrigued. Whether he wants to admit it or not.
You are doing so well right now. I applaud all your efforts, all the things you are doing FOR YOU. Hang tough!!!