The good thing about this is that she will be a lot easier to coparent with.
It is kind of like a get out of jail free card. It releases some of your questions like "what the hell did I do wrong in my marriage?". I got the same thing in the form of a letter and then her asking for another chance.
I cant really give advice on what you should do or think. It is different with every person. You will figure it out in time.