I can give a little input on this topic as a parent and as a teen.
I was 17 when my dad left my mom. And yes, he cheated. And yes, he married OW. It’s much more complicated than that, but, from my perspective.....
I knew what my dad did. But my dad was my world, the one who raised me and I didn’t want to know about it so I avoided asking for a long time. I just didn’t want to know. I just wanted him to be my dad. I wanted out of their issues
As a parent.... my daughter has come right out recently and asked me if her father cheated on her. I at first asked her “ do you really want to know? Is this going to benefit you at all? Then I distracted her with the cookie stand we were going to, because she is 11 I can distract her with cookies.
I will tell her the truth when I have to. Not with angst and bitterness, just with truth. I dread the day it comes that I have to answer it because I don’t want her relationship ruined with her dad and stepmom. But like juju, my daughter does know this wasn’t my choice. Tough stuff. It’s unfortunately. It in any parenting book