My boyfriend accidentally saw a topless photo of my bestfriend. Am I overreacting if I feel upset that he even saw it?

I'm a photographer and have a lot of files of various people on my Dropbox. Initially, I didn't want to share my desktop computer with my boyfriend because it's personal—I bought it specifically for work-related tasks, given the large number of work files I have. Recently, I thought I had closed out my main tab where many of these files are stored on Dropbox, but I guess I didn’t, or the computer glitched. As a result, he saw a topless photo of my best friend from a photoshoot I did with her. I know men think differently than women. I hate the thought of that image even popping into his head ever again, and I hate the idea that he even saw that, especially since my friend and I are so close. Although we've never had any issues with infidelity, should I be less upset than I am?

My boyfriend accidentally saw a topless photo of my bestfriend. Am I overreacting if I feel upset that he even saw it?
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