I walked in on my girlfriend in bed with another guy?

So after two wonderful years with my girlfriend, I arrived home last night to find her in my bed with another guy. She has apologized and said it was a mistake, but I don't know what to do, as much as I love her, I don't know if I should break up with her or not. What are the chances that she'll do it again?
I walked in on my girlfriend in bed with another guy?
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