I am back from my "vacation" and I am sad to hear what you had to experience. I guess we are all (I read the other threads to keep up), having a bad week. Glad we can come here though. They don't have something similar to act as a reliever.
I guess my T is right. I don't know if this expression exists in English, but at this point you must throw the monkey back to his shoulders. Let him and the OW feel scared about the next moves.
I also read during my time away that if they leave to be together, the statistics are that they will not succeed. Mostly because they look for things in others that they cannot bear long enough because is just not who they truly are. It's just the momentary thrill.
I think that right now he is probably in denial of the consequences of his acts. There will be a point in time when he will see the light in the end of the tunnel and it will be a train coming in the other direction.
You on the other hand will still have all the opportunities to have a fulfilled life with your girls.