Seems to me all you need is space and some backbone. If your hangging out and she starts acting hositle just tell her if she dosn't stop you'll leave and do so if it dosn't stop immeditly. If the boyfriend calls you a Bitch, sorry I don't need to put up with abuse, and walk out. He is going to wreck something your sister wants sometime and when you walk out, she's going to be all over his ass!
Don't do that to my sister.
Respect your self enough to walk away. Maybe something will rub off!
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