A friend of mine was counselling a woman who'd been cheating on her husband. She ended the affair and resolved never to tell her husband about any of it. She said "If I told him it would put a bomb under our marriage."
What would you reply?
My friend's answer was inspired:
"The bomb has already gone off. You've already exploded it. It's torn through the heart of your marriage. There are people bleeding to death and you're wondering whether you should tell someone?"
Maybe you're reading this and you're the one who's set off the bomb. You must tell. It's the only way forward.