I was talking to a girl and said I've never cheated, and she had a big smile on her face. Does that mean she's cheated on someone?

We have an attraction and in conversation I mentioned I've never cheated physically or emotionally on ANY girlfriend, and when I told the girl this she had a BIG smile on her face. Does that means she's cheated on someone or something else like she likes that type of loyalty?

I was talking to a girl and said I've never cheated, and she had a big smile on her face. Does that mean she's cheated on someone?
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