Richard, sorry you are here, but welcome to you. You need to catch your breath, and prepare for what will not be a pleasant experience. Your wife is NOT a good Christian woman. That is the first thing you need to accept. She IS, however, an adulteress, a liar, a disrespecter, and a manipulator, and you need to accept these things as well. Know that everything she says about the affair is probably a lie or an evasion to try to minimize the damage she has caused. YOU ARE NOT TO BLAME!!! SHE IS!! The time frame , since the affair, means nothing at all, because you only have her word for it that there were not other affairs, at other times. For your peace of mind, get the Poly done, then grill her repeatedly, until YOU are satisfied that you have gotten ALL of the truth, then realize that even so , there will be some things that she will try to hide. THEN, after you are sure in your mind that you know all, THEN you decide if you want to reconcile or Divorce.