Is flirting cheating?

Flirting is a type of sexual behaviour, though it does not include any sexual contact. If it does involve someone who is not your partner would you see this as cheating?

I've come across questions on here asking if it's ok to flirt when in a relationship. There a lot of opinions. But lets get straight to the point, is it cheating or not, and why?
Is flirting cheating?
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