<human>: Can you provide a brief rundown of the text in within 3 sentences?

I've been in a relationship with my girlfriend for about 1.5 years. She's my second serious girlfriend while I'm only her first. We've generally been happy over the time that we've been together, but we've hit a rough patch over the last three or four months because we've both been busy with school and so we haven't been able to see each other that much (we live about an hour's drive from each other).

From the beginning of our relationship, she was always very concerned with what I'd done with my ex, how far we'd gone and other things like that. I always tried to avoid answering those questions because I felt that it would've done more harm than good for her to know, since she gets upset easily and I knew it would affect her a lot. One of the questions she asked me was if we ever exchanged any naughty pictures - I told her no, partly because I wanted to protect her feelings and partly because I didn't think it was necessary to tell her.

Fast forward to today. I left my Dropbox account logged in on her computer, and she went through all my photos - including a dirty one from my ex. She flipped out on me and said I abused and violated her trust, and she wants a breakup. 

Before this gets into a debate over whether it's right or wrong to keep such photos, I'd just like to say that it isn't like I go back to the photo to jack off to every few days or anything. I haven't looked at it since we broke up about 2 years ago, and I completely forgot it was there cause the folder is really full. I've deleted it, but the damage has already been done.

On my part, I know I fucked up by lying to her about the pictures. But my intention was to protect her feelings, not for any selfish purposes, and I feel that matters involving exes are private. Regardless, I've apologized and said that I'll make it up to her and slowly try to gain her trust back by being completely honest with her about everything in the future. She says she doesn't want to do it anymore, and we should just break up. What should I do?
<bot>: Told girlfriend I never exchanged nudes with my ex when I did, she found them and now she wants a breakup because her trust in me is gone.