Guys.. I hate my boyfriend's sister. How to avoid her but she is part of my family now?

My boyfriend's sister is such a playgirl and now dumped everyone to get married to a rich boy. I was a witness that she had two timings. I can't stand and my mind keeps thinking about that. But I want to avoid that and her. how do I do that? I don't want to know about her but my boyfriend tells me about her. I don't want him to know that I hate her. Help guys !!!

Guys.. I hate my boyfriend's sister. How to avoid her but she is part of my family now?
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