Blue- I haven't followed your story totally, but I am going to chime in on a couple things.
First, when he does things that you don't understand, he is probably doing it to A: Relieve his guilt or B: To ensure that he exits your marriage as financially stable as possible. My C told me this about my XW, and at first I thought it was too simplistic, but in reality it is right on.
Blue, as hard as it is, you need to accept the papers from him with dignity. Begging and pleading puts you at a position of weakness and it is unattractive to him. No amount of logic or reaxon will work. It only cements his desire to leave.
The reality is that if he wants to push forward with the D, then he will. You need to accept that fact.
As far as what to do today, con't be there when he drops them off. Text him and say you lost track of time and he can just leave them. That way you can read them and react alone.
As hard as it is to believe, you will survive this. It wasn't too terribly long ago that I thought I couldn't live without my XW. If I can make it, anyone can.....
Me: 44 S: 17 and 7 Final-6-13-08 I once went to a psychic who told me I would soon feel cheated......