"No, I'm not that kind of woman. I have a lover, and I've only done that with him." She was calm now.

Or at least her tone was.

If she made a scene, Isaac might justify his actions by saying that, as his wife, he was entitled to do whatever he pleased with her. Therefore, she must keep her cool.

Isaac stared at her quietly before saying, “Leave that man.”

He had calmed down as well.