Would you feel guilty if you did the same? What should be done now?

*This story is originally of a guy whos not on G@G*

Me my girlfriend and my friend have been hanging out for a while, we are all 21. I've been dating my girlfriend for last 5 years and been friends with both of them for at least 7-8 years since end of our middle school. We have all been good friends, and always hang out together everywhere.

2 weeks ago me and my girlfriend went to a beach, it was some kinda festival. For 2 nights.

So as he missed on the festival, I decided to show him all the pictures sitting in my car. He was looking at what he missed on, after 30-40 pictures, I kept scrolling.

Suddenly when I scrolled it landed on a nude picture of my girlfriend, well topless, and I saw his eyes opened bigger. I scrolled it asap, which was my biggest mistake because the next was the picture of my girlfriend completely naked, sitting on the counter top with her hands in her *kittie*. I turned my phone off, and dropped him home with no talks.

Well he said he'll forget it all later , but i feel kinda guilty. Because my girlfriend doesn't like stuff like this, but she sends me these pictures sometimes as we dont sometimes meet a whole week or two.
And I dont think so my friend would see her as he used to see her before

Should I tell her what happened? Or keep it a secret?
Would you feel guilty if you did the same? What should be done now?
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