Well, I agree with the part that says that affairs ruin your reputation. And, I don't say to lie to cover up. He made it sound like he was wanted to go "out" her. If his friends and family ask, he could say that it is her issue and they should ask her.
I am different now. I may have had a different answer before going through my own things. I try to help people, not hurt them. And, it's not my job to decide someone's fate.....