How to stop being insecure in my relationship?

Anonymous
My girlfriend is one of the most beautiful girl in her college. It's her friend's wedding next month and they are planning for a dance surprise. I just saw the practice session and she and her moves looks really gorgeous and hot. She have the best body shape among her friends.

I'm sure that this dance will circulate a lot in internet.. which may lead to other guys comment on her.. sent messages.. try to flirt with her.. these tbh I'm feeling insecure and jealous. I know this is a bad thing. How to change?
How to stop being insecure in my relationship?
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