If your SO kisses someone, is it still cheating?

As kissing is normalised today, is it still cheating. My girlfriend is an actor and she kissed (on lips) multiple girls and guys. She even shot naked and sex scenes for short films. Should I be worried?

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Many people are saying that I should leave her. But I have been with her before she joined acting classes. It will be unfair for her.
If your SO kisses someone, is it still cheating?
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