That reads as so disrespectful and violating. So, the two of them got together to discuss the guy having sex with OP....Without even contacting OP. Like they said, they just view them as a sex object. Also the female friend is not a best friend and they should stop calling her that. If someone decides to act like a cunt to you and NOT tell you what’s wrong then they can fuck off. Perhaps it was jealousy, it which case why is she poly if she’s prone to that? Doesn’t seem like a recipe for success anyway.
Damn, I can’t imagine discussing with my partner whether it’s okay for them to fuck someone else.