What should I do?

My guy has a best friend who is a girl.. and i don't like her because she makes him do some stuff that i don't like.. i have had a convo with my boyfriend about this but he says that you know we are good friends and i have asked him i will try to understand but at least when u are with her you don't have to upload pictures everytime u meet but he meets her everyday and upload pictures through her account.. we end up fighting everyday but he still uploads pictures or she does..
What am i supposed to do? I'm trying to understand their friendship but everytime i try that i find out something new about them.
What should I do?
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