Sounds like this news fits the category of wonderful for you, so we applaud. Of course, a glass of that champagne would have been nice right now.
Do not let go of the power of suggesting a trial. Now that they seem to want to avoid it, if he begins demanding more than fairness in mediation, stand up and repeat the word Trial several times. Then act as if you have lost your mind and repeat words such as "adultery" or "cheating on business taxes" or whatever feels good to say.
You will be fine. You know this. It is all part of a process that you should know does not end quickly. And BTW, it can on occasion jump back up and bite you just because. So the detachment you learn now may support you again down the road, if you know what I mean.