If you hear the sentence “John has been cheated on by his girlfriend”, what do you understand?

John’s girlfriend had sex with another person
John’s girlfriend was unfaithful somehow, it could be sex but also just writing to another person, flirting with another person etc
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Or formulated otherwise: if Johns girlfriend hits on Fred, but Fred isn’t interested and turns her down, would you still say John has been cheated on?
If you hear the sentence “John has been cheated on by his girlfriend”, what do you understand?
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