Let her speak

She stops and sees the papers. She looks up at you, guilty and angry at the same time, not knowing if she should apologize or be upset as well. Tears start to well up.

"Gawd, I....I am sorry. I mean, I didn't mean for you to find out this way, but...at the same time, how could you invade my privacy like that? That's exactly the kind of thing that has been driving me away, and yes, into the arms of other men. And no, I haven't cheated on you...but...but now...after you pull something like this....I think I have to."