How will you expect her to show her choice? To just say, "Fine, I'll stay.", or to have specific actions so that you know she is staying? Will you require marriage counseling or Retrouvaille? You should be aware that she can say something now and change her mind in a day or two. My experience was that my husband said he would end the affair, but then he continued it in secret. It is extremely difficult to know that the affair is completely over.