She then told me that she'd prefer never to hear about it. Some things are better left unsaid.
that has always been my stance.
Don't tell her. Ignorance really is bliss.
As much as I do what I do .... I am still a woman. I know that a lot of men (and yes - a lot of women) stray from their relationships and I understand that every relationship has its complexities and there are often understandable reasons why one party may stray....
but at the end of the day ~ regardless of what I understand (because of what I've seen and heard during my time working in this little word).... I'd be hurt if I found out my significant other was partaking in the services of someone like me. If I'm with someone who loves me but strays... I would just hope he respects me enough to hide it from me and those who know me. I don't want to look or feel like a fool.
Just protect her from it. You aren't a bad person for having seen escorts - she likely will not understand. Women and men really do have differences between how they do or don't compartmentalize sex and love. Telling her may clear your conscience but it may very-well cause her pain.