Gosh hawho. This must be tough. I hope you and the kids are ok.
While it is unfortunate, I think some mlcrs have no choice but to marry their APs. Their actions are so shameful (whether they feel shame or not) that they have to prove to everyone around them they made the right choice in blowing up their lives.
Also, and this is just my novice belief, I actually think they get to the point where they continue to chase happiness and when they are looking for the next joyous moment, they remember times when they were happy in their former marriage so they attempt to recreate it by marrying the first person who will have them.
The fact that the wedding was private is very very telling.
Anyway, I really do hope you are processing it and moving the heck on with your peaceful life.
Me- 30's H- 40's T-10 M-5 I moved out b/c he wanted space- June 15 D filed by H: September 16