Yeah - she was a girl he had been friends with in college, never slept with, and one of many college friends he invited to our wedding. My H and all his friends all slept in the family home, while I slept with my family in the lake house where the reception would be, a half hour away.
Apparently they all were drinking together, then they went to bed, then she crept into his bedroom and they had sex. HIS story was that he regretted it instantly. I put it down to last minute jitters.
6 months later I found the journal where he was mooning over her. I tried to throw him out then but he begged and pleaded. It wasn't until a few years later when I was 9 months pregnant with our second child that I discovered that she had gotten pregnant from that encounter and had had an abortion while we were on our 6 week honeymoon. Ugh