Sorry to hear about the discouraging news. I see some mind reading going on. You cannot control her actions, if she told you yes she is having a PA would that make you feel better? I had the same thought about my wife and it did nothing but snowball into more negative emotions.
She is looking out for herself now, which is harder for you as you still want to build a future with her and she is not interested. Rejection from a love one is a tough pill to swallow.
Give her space, continue to improve yourself for the better, be the best dad you can be for your kids. They will be going through alot now too.
Keep your head held high and continue DB'ing with grace and integrity!
H 37 WAW 32 S 4 (Autistic) S 2 Together 11 years Married 6 Bombshell Dec 1 2012 House sold, flying solo June 1 2013.