MY SISTER knows who I have a crush on. How do I stop her from embarrassing me?

I kinda maybe sorta sent an email to my crush confessing I like him. He never responded and I just figured he didn't like me back and I should just try to get over him. But then a week later he sends an email to MY SISTER saying that I like him. Now my sister is threatening to go talk to him even though I have been begging her not to. I didn't want anyone but my crush to know my secret and now I feel embarrassed for even liking him in the first place. The worst part is, I still don't know if he likes me back. WHAT DO I DO?
MY SISTER knows who I have a crush on. How do I stop her from embarrassing me?
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