Hey joshguy, You don't have to do anything to lose respect in this situation. While in the affair she may notice things about you that never where a big deal, this will become the focus and in the end she can end up hating you and not respecting you for something SHE did.
Its crazy and how these things turn out many times. Its why alot are saying the "be the better option" approach is not that successful. You do this and the 180 for yourself.