My boyfriend’s brother’s girlfriend hates me how do I deal with her?

I’ve been dating my boyfriend for only 2 1/2 months and he lives with his mom, older brother and his borthers girlfriend. Things seemed fine at first but his brother and brother’s girlfriend started complaining about how I wasn’t friendly enough and making all these
digs and criticisms at me. After my boyfriend argues with them and stood up for me, I apologized to his bother for any misconstrued behavior. His brother was nice about and we went into the kitchen where His girlfriend decided to size me up. She looked at me and went “I don’t need my boyfriend to be alone in a room with another girl it’s disrespectful me” trying to act tough. I think we were all really confused by her attitude and later when me and boyfriend talked about we assumed she was the one orchestrating the problem and trying to make me feel bad because she has extreme jealousy issues and is insanely controlling of her boyfriend. She even made comments to my boyfriend about like “if she wants to be friends with me she needs to come out of her bubble I don’t talk to people I don’t know”, “ we’re only looking out for you in case she’s bad”, and “I don’t need to share drinks with her I don’t know where her mouth has been”. I think each of us are disappointed with her amd it seems she has a serious problem with me hanging around their house due to her jealousy. I’m happy with my boyfriend and want things to work but I feel she has a problem with me being there. How do I even deal with this situation?
My boyfriend’s brother’s girlfriend hates me how do I deal with her?
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