My boyfriends brothers girlfriend dislikes me?

Mbaby889
Me & my boyfriend have been together 4 years , both 18 & his brother almost 3 years with his girlfriend, her 18 & him 20. It started one day in school she told my cousin to tell me that she didn't like me but i ignored it. 5-6 months later she moved in to my boyfriends house & started telling my boyfriends mom that i would mess with her in school, talk about her, laugh in her face & a bunch of things which their all a bunch of lies. I have never been near her expect when i go to parties that they make. She started trowing slugs on fb saying that me and my boyfriends cousin would stare at her apparently but mind you that as soon as she said she didn't like me i had a feeling that it was because she wanted to be the favorite one & she proved it because instead of telling her own mom all those lies about me she would tell my boyfriends mom instead. And when i go to my bfs house it seems to me likes she trying hard to not let the mom talk to me, she wants her all to her self. Oh and my boyfriends little sister asked me if i knew her and i said no and she got mad and told my boyfriends mom which that wasn't even anything bad like what the heck!
My boyfriends brothers girlfriend dislikes me?
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