I don't know how I would have been able to handle that, if he had to work with OW. It is a difficult thing I am sure.
He says he told her, he loves his wife and family snd that it should never have happened and that he didn't want any further contact unless totally work related which should be by email.
This is PERFECT!
I know it's hard, but try to focus on you and your husband and how hard he is working to earn your trust back and rebuild your marriage. Don't give her any more space in your head. She isn't worth it.