So sorry to hear this. There will be other difficult things to deal with, I believe the day that the children find out is the hardest.
Become "Supper Dad" while it is your parenting time.
Now is a good time for you to double down on your DBing efforts as well. Reread sandi list as well as all the links you received right after your first post.
Take stock of what you have done, what you believe is the right thing to do. Come up with a plan and execute the plan.
Sorry again.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712