I do not want my children dealing with our adult issues. D:13 has showed very little emotion about this. S:8 has been crying quite a bit. I am a mess myself. I have not really talked to them about specifics. I just tell them I love them and so does mom. I tell them I am trying to keep us together and that I love their mom.
Here is the thing - kids respond well when their parents are happy and whole.
So you need to re-think all of this.
FOCUS on YOU not the marriage or your wife.
If you were on a plane that lost oxygen you have to put your own mask on first and save yourself or you will be no good flailing around trying to save someone else when YOU cant breathe.