Originally Posted by MattMatt
Or being in a state of shock that the one you love could do that to you?
Past behavior is the best indicator of future behavior. If your spouse has a history of having ONS before you met her, then she is capable in the future. If she cheated in past relationships then she CAN do it in yours.
Shock should be when she cheats randomly but was honest and moral her entire life till then, not just faithful during your marriage.