Do you guys have friends that always flirt with you even tho you are taken and joke with eachother?

Well my girlfriend tells me she has friends that flirt with her and joke. But today her friends came up to me and said your girlfriend has a new boyfriend I got kinda pissed he said just kidding. I didn't really find that funny tbh I dont like him as my girlfriend best friend and her other friend talks to her a lot everyday more than me but im supposed to put up with this they also talk sexually I feel like something is going on. They also plan on meeting and stuff I don't know.

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9 mo
Im just confused on like how am I supposed to deal with this if its a daily thing.
Do you guys have friends that always flirt with you even tho you are taken and joke with eachother?
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