Thanks for the input Sandi. I expect that she will deny have any more contact with him, but I have my evidence. I take some responsibility for the EA, but to continue with it after I confronted her about it is not acceptable. I can't tolerate her living in my house while she invests with another man.
I will forgive her for the EA but not with continuing it. She needs to know that her sneaking around is not acceptable and at this point I am prepared to give her the ultimatum: end it or move out.