My girlfriend had a dream that she cheated on me. What does that mean?

She wanted to tell me right away, but I was asleep, so she shared it with me the next morning. In her dream, she sneaked a guy from her work into her bathroom to have sex. She mentioned feeling it was wrong because she's with me, but in the dream, she still wanted it badly. She doesn't remember anything else, just the guy leaving afterward. I know it's just a dream, but I'm finding it hard to let it go.

My girlfriend had a dream that she cheated on me. What does that mean?
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