You need to confront your W. If not about the A, about your kids. She is seriously messing them up. You don't talk bad about her, she shouldn't use them against you.
She's going to totally mess up their thinking. How would you like it if she told them YOU cheated? Who knows? Maybe that's what she's doing.
Even before you found out about the A, we figured out that she didn't have the interests of the kids at hand. PROTECT YOUR KIDS! They need YOU now more than ever. That's something you shouldn't tolerate and nip it right away.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.