She does know he's married, obviously. But does not know he's still telling me he's confused, isn't sure about divorce, put the divorce on hold, is going to therapy, etc...
As far as she knows he left me for her and never looked back. She is extremely insecure though. She won't even allow him to say my name.
I'm certain one text/ call or email from me would send her packing but I'm not going to do it. He made this mess, he can clean it up. He says he'll end it with her. We'll see.
