Why does he like my sister more than me?

the guy i like likes my sister more than me and treats me like shit, he treats her like a queen, while she is lazy, doesn't work, aggressive and rude , i on the other hand am classy and a hard worker but he prefers her? i wish her all the luck and i am not jealous, its just fascinates me how men always go after bad girls?
Why does he like my sister more than me?
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