Bam, I would not show H the letter. It is not as if he had his friend over when they were there. Your H did not intentionally expose your children to this. Your S11 is just smart enough to piece it together from the clues.
I think you should tell H that the kids had asked you about the D and that you told them the truth. He can't expect you to lie to them.
Me45 H45 D13 S10 together-23 years married-21 years MLC Divorced 10/3/07 Married to a wonderful new man.