There is nothing in the history of the last two years that suggests the two of you can have a discussion with anyone, let alone your children, without a disagreement or conflict.
Quite frankly, your kids don't need anymore drama in their lives. I would think by now that it's fairly clear to them that Mommy and Daddy are no longer close. Living apart from YOU will be the hard part for them. Your wife is certainly not going to make them feel any better about that part - only you and your loving compassion towards them will make the fears subside.
Just food for thought Frank. I know you will make a thoughtful and proper decision.
Blessings,
Bill
"Don't tell me the sky is the limit when there are footprints on the moon."