My boyfriends sister is toxic?

I’ve been dating my boyfriend for 3 years. He has an older sister who is not a nice person at all. I’ve tolerated her and even tried to be close with her but I’ve had no luck. She acts nice to my face but then will say all the issues she has with me behind my back to my boyfriend. She’s really hurtful and all I’ve tried to do is be nice to her.

I feel like I can’t have her in my life but I don’t want to break up with my boyfriend over it.

What do I do?
My boyfriends sister is toxic?
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