My sister compares her boyfriend to mine. HELP?

Why is my sister always compare my boyfriend to her boyfriend. It's very annoying. I love and care about my boyfriend, he treates me very nice and makes me happy. I never actually talk about him to her, because of her attitude, but she still takes what she gets to make him look bad. I just want it to stop!
My sister compares her boyfriend to mine. HELP?
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