My boyfriend's twin hates me. Why is she like this?

NatalieIsHere
I get along very well with his parents, they seem to like me a lot, they always treated me very well since we were just friends, especially his mom. I think she is probably the closest thing I've ever had to a mother.

But for some reason, I can't possibly get along with his twin sister, she doesn't like me at all. She is always trying to argue with me about everything, she doesn't even greet me when I enter their house and she's frequently talking bad things about me to her friends at school. My boyfriend is always trying his best to get us closer to each other but it's no use. I don't remember anything I could've possibly done for her to treat me like this. Why does she treat me so bad? What can I do to improve our relationship?
My boyfriend's twin hates me. Why is she like this?
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