I really don't think talking to her will ever be a good idea. But I don't mind that you threatened to! I don't mind if she has to look over her shoulder a bit to see's who's behind her.
He was weak... with you and with her. What is sad was you gave many chances to come clean, and start fresh, and he still couldn't do it. Or wouldn't. Or didn't want to. Doesn't much matter does it, the result is the same.