My girlfriend of 1 year told me she went on Omegle found a random stranger then exchanged kiks and sent him a topless nude. How should I react?

So yesterday she told me she sent a nude to a random person via Kik and I didn’t know how to react. She said that right after she did it she immediately felt horrible and regretted it. When she told me last night she was crying and when I didn’t answer she called me a million times. I ended up answering and she ended up driving all the way to my house to say sorry a million times. I didn’t breakup with her because I honestly love her but it did break me and I just don’t know if I made the right decision or not. I’m all about forgiveness and second chances but I’m training to be a pilot and I need to have trust in whoever I decide to be with, to count on them to not cheat on me while I’m gone cause they’ll have plenty opportunity to. I don't know.
My girlfriend of 1 year told me she went on Omegle found a random stranger then exchanged kiks and sent him a topless nude. How should I react?
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