<human>: We've been together for more than year, but she was studying abroad for about 6 months. Earlier today, I was sitting in her room while she was getting ready for school, and I saw her diary sitting on her desk. I'm usually not one to snoop, but I know she keeps a list of the people she's slept with in the back of the diary (I have no idea why), and curiosity got the better of me. I flipped it open, and saw five names after mine. I was really upset, but I kept it together. She doesn't know I saw.

I guess there are a couple of possibilities: 

1. She's been sleeping with other people while we've been together (as in, she's been in the US with me at the time)
2. She only hooked up with people when she was abroad.

If it was the first, I'd be really hurt, and I'd probably break up with her. 

But if it was the second, I think I'd understand. I slept with people while she was abroad, so I think it would be wrong to hold it against her. We were apart for a long time, and we  both got lonely. She did make it seem like she hadn't slept with anyone (she called once after kissing some guy in a club and tearfully apologized), so I guess it would make me a bit upset, but it would be pretty hypocritical to get too pissed about it. 

My question: How should I go about figuring out which one it is? Do I just ask her outright? If I do, how should I phrase the question?

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<bot>: My girlfriend probably has slept with other people, but if she did it while she was abroad, I don't really mind. How do I find out the story?