Like many women in her situation, Elizabeth says she wanted to know the details of her husband's affair. "I'm a puzzle-doer," she says. "I had pieces of the puzzle, and I felt like it was going to make sense if I had all the pieces."

Oprah: Is the first thing you wanted to know is, "Do you love her?"

Elizabeth: I'm sure that I asked that, but it seemed impossible to me, and I think, impossible to him. This is a person very, very different from me and really very different from him.

To this day, Elizabeth says she and John don't really know why he cheated. "He really has tried, I think, to figure it out, and to talk to people and try to work that out, but I don't think he really knows," she says. "I mean, it was opportunity and didn't seem like there were any consequences."