Wicked little grin? Or a sad, pensive expression?To me, that is the very worst of the worst.
Imagine... all those years of pretending like nothing ever happened. Being trsuted, loved and respected as a chaste and virtuous person in a crappy world. All the while behind one's smiles lies the heart of a deceitful betrayer. Accepting all that love, all that trust, all that faith. Taking their arm when their SO is telling people how you would never betray.... And just this wicked little grin on their face...