Why does her friend text her mad?

I was just with this girl and she was texting but she was in my arms so i see her screen and she kept sending snaps in my arms to people but one of her friends kept asking who she was with and got mad when she heard it was me and texted her ‘you’re unbelievable’.

So does her friend just not approve of me or what could be going on lol. I also barely know her friend

Why does her friend text her mad?
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