should i be worried about my girlfriend cheating on me is the 6th grade?

i know it may be a dumb question but i want to now because my girlfriend likes to keep our love a secret and i’m ok with that and all because she doesn’t like those people who insult us and i’ve recently seen a kid flirting with her but i can’t do anything without letting out our secret and is it natural to want to beat up the kid flirting with her

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