My boyfriend's sister is toxic and drags me into fights that have nothing to do with me, more between her and my boyfriend. Do I leave him?

youdontknowme124543
We are all in our late 20's. She tries to control him and gets upset when he doesn't listen to her (because he's a grown ass man) and somehow she takes out that anger on me for not "being on her side." We are all adults and I let him do what he wants because I trust him and he can make his own decisions. Anyway, I've always gotten along with her and realize the importance of respecting your significant other's family. However, I am being dragged into their disagreements that really have nothing to do with me. I usually ignore her, but she is pissing me off. I told my boyfriend since it is his sister, he needs to deal with her and let her know to stop involving me and leave me alone because I do not want to fight with her. He barely wants to deal with her toxic behavior and therefore he just ignores her as well. Even his mother agrees she is being unreasonable. But I feel he is just sitting back and letting her put a strain on our relationship because he doesn't want to deal with her either, he thinks she is a lost cause. He says, "okay, I'll talk to her" but I know she is not going to listen. Part of me is okay with just ignoring her because I don't want to let her ruin my relationship with him, but at the same time I think it is so annoying to deal with. It is his sister and I'm not going to make him choose between us. Anyway, is this something I can just ignore and focus on my relationship with him? Or do I need to get the fuck outta there?
My boyfriend's sister is toxic and drags me into fights that have nothing to do with me, more between her and my boyfriend. Do I leave him?
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