<human>: Could you distill the essence of the text into 1-3 sentences?

Years ago when we were dating but planning to marry my (now) wife was asked to take her father's college roommate and co-author of his textbook out for an evening when he was in the country for a few days. My wife had done this before with another person and asked if I was okay with her doing this again for her parents. I trusted her and agreed. He was much older and a friend of the family as well.

During that night my wife showed him around various places in town. He was critical of everything and told her that things in the Netherlands were better, I remember her telling me this then. Then at some point they returned to her apartment, which she of course did not tell me. When her mother had mentioned something along this line about how things went weeks later, some truth came out and my wife admitted that they had gone there. She played it down and I am only now finding out years later that things went further than she told me. Her story has gotten worse over time and it keeps changing in terms of what happened and why. It has gone through several changes in her version of events.

Her argument now is it was years ago, we weren't married, he took advantage, etc. I argue that I was lied to this whole time and that she only just admitted so much, so it basically is something entirely new to me. Am I correct to be upset now? Is my loss of trust reasonable? Or is she in the right that I should get past it for what has been an otherwise great marriage?
<bot>: I trusted my wife years ago to show a visiting family friend around. During that evening she wronged our marriage. Am I right to be angry even though so much time has passed?