Why is he trying to manipulate me?

My sex buddy asked me to do group sex. I said no. 6 weeks later, he told me that if I ever have s*x with his friend, he'll kill me or never talk to me ever. Isn't this weird?
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The group of boy's were his friends. I feel like he hates me for no reason. I'm really good to him.
Why is he trying to manipulate me?
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