From one week to the next, she told me two different stories about her first intimate experience with her lover—weeks before our wedding day.
She told me when it occurred, during lunch hour at work, what town, exactly what they did, etc. The following week, she told me her first time with him was at night, in a different apartment, in a different town, and they engaged in completely different intimate acts.
If you have been with only one man in your life, and you are weeks from marrying him, you'll remember your first time with another man—that lasted for at least two years after your wedding day.
Most concerning is that when I asked her one week after she told me "the truth" and atoned, I asked why she changed her whole story. After a palpable pause, she said, "I don't know." She has also acknowledged that she doesn't know the difference between the truth and lying.
Now, her reality testing is intact. So that leaves a few possibilities—she was trying to preserve her dignity (i.e., one of her excuses), and she was trying not to hurt my feelings. Well, evidence-based studies on infidelity demonstrate consistently that in order to overcome infidelity, you must start with honesty and transparency.