Do you want your marriage to work? Yes, I assume. So, act as if there is no other woman! If he is moving back, take that as a big step forward. Do not push him away by focusing on the OW. Focus on yourself. Be attractive, not needy. Go out of your way to be the YOU that he once found so attractive....remember her? She wasn't mistrusting and she wasn't clingy and she wasn't a nag. Right? So, be the YOU that is attractive to him. Forget the OW and focus on making him forget her, too...by being a wonderful, sexy, YOU!