AIO - My (35m) girlfriend (37f) sent nudes to another man for $

This morning I opened the Photos app and discovered that my girlfriend had taken 10+ nude photos of herself. About an hour later, there were more. She had accidentally saved them to our shared photo album, which is how I saw them.

I confronted her about it over lunch. She became defensive and argumentative, and eventually told me she had done it for money.

We haven’t had much time to discuss the details yet (our conversation was only about 30 minutes), but this is what I’ve gathered so far:

It was someone she already knew.

She says she’s not attracted to him and it was purely for money / attention.

She says she only sent him one photo. But nudes taken at 10pm and then more at 11pm?

She showed me the Zelle transaction, so I know she received money.

As far as I can tell, she had no intention of telling me about it before, during, or after it happened.

She has never sent me intimate photos herself.

I’m struggling with how to categorize this. I understand that people can have different boundaries around what constitutes cheating. For me, the biggest issue isn’t necessarily whether she was attracted to the guy. It’s that she made the decision to send an intimate photo of herself to another man in exchange for money and apparently intended to keep it from me.

So, if your SO sent an intimate photo to someone else for money without discussing it with you beforehand, would you consider that cheating?

Or would you consider it a different kind of relationship/boundary violation?

I’m genuinely looking for outside perspectives, especially from people who have been in similar situations.