I also agree you should re-read everything Unhinged's post.
And I think OhItsYou's following comment is important.
The "what else did you look at" comment is the important part.
Don’t believe you looked at everything? I mean, you admitted to what you saw. She didn’t think to herself that you know everything, she was wondering if she was going to have to admit to something more if you had found whatever other thing is.
This is why I was saying you shouldn't admit to what you know, but instead ask her if she had anything to say. Would she have admitted to being in contact with Marcus and Ines? Now she gets to say it wasn't important to tell you. Also, I absolutely do not believe that Leonor regularly brings multiple changes of clothes to events. Maybe one, but come on, multiple? If you're at an event where it is likely that you are climbing on someone's shoulders, what are you doing wearing a slip dress with a deep-v neckline. Is that what she changes into? None of that makes sense to me.
It's a sad fact, but quite often the type of person who commits infidelity in the traditional sense also disregards their spouse and their marriage and does not openly reveal their interactions with others. I see all of that here. I think it's naive to say de facto that there is no infidelity here. You simply do not have definitive proof of that. Right now, anyway.
I did say that the night makes sense if your wife saw the after party as a business or business networking opportunity. But again, why didn't she share that when she came home? That doesn't fit. And I could see a follow-up business project, but I can't see it as an immediate event where she makes more than her annual salary. More conversations and exploration and a smaller, starter, or trial type project make more sense.
The paragraph that stands out most to me is from the morning following your fight. Your wife was quiet and thoughtful and said she was going but not choosing the job over the marriage and family.
Not because of Marcus, but because this was a major opportunity for her career and ultimately for our family. She reminded me that in 17 years together she had never given me a reason to think she was cheating before this. She said she had never cheated on me, believed my insecurity came from what happened that night, and said she wasn't going to throw away an opportunity because of assumptions. She also said she didn't believe going to the gala would end our marriage.
Particularly the following sentence.
She also said she didn't believe going to the gala would end our marriage.
She had the night to think it over. The following makes sense.
It was just Sofia being Sofia. Sometimes she does exactly what she wants, even when I'm not comfortable with it. Then the next day, she's much kinder and tries to soften me up.
Your wife does not believe there will be any consequences to her marriage or her family if she continues to disregard your feelings and act the way she always has and simply do what she wants. That's a harsh reality. Will there be consequences? What will you do? All these questions are why I think showing restraint and gathering information and evaluating is the wiser choice than having a vulnerable conversation or confronting right away. However, you have done it. It is very difficult, so congratulations. You also have gained valuable knowledge about her mindset.