Assure her that her husband will understand
From Create Your Own Story
"With everything that's happened, I think he'll understand," you say. "And if he doesn't, we'll sort that out then."
She nods slowly. "You're right. You are." She thinks on it for a minute and mulls it over. "It's the last thing we should worry about right now. But this can't happen between us again. It was a one time thing."