My boyfriend is friends with his brothers girlfriend who has always been disrespectful of me, is this a red flag?

Anonymous
we’ve been together for over a year. She has never approved of our relationship even though she's never taken the chance to get to know me. I've tried several times to be civil and even friendly with her but it never works. She tried convincing him to not talk to me when we first started dating and tried hooking him up with one of her friends. Long story short, we couldnt let go of eachother and we’ve been together ever since. Through out our whole relationship, she's always talked bad about me, made fun of me and forces my bfs brother - the one dating her - to block me on social (we were once friends on social) and treat me like trash or like i dont exist in person too. I can tell this isn't his typical behavior and its her making him for the “sake” of saving their relationship. My boyfriend and his brother are best friends and I won't come in between them but the fact that he's still friends with his girlfriend who continuously disrespects me really bothers me. He claims he doesn’t like her but doesn't say anything to stick up for me or remove her from his friend list off anything (not that i asked him to remove her) Is this a huge red flag? Im stuck on what to do. Im tired of being nice all the time and just brushing it off.
My boyfriend is friends with his brothers girlfriend who has always been disrespectful of me, is this a red flag?
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