My boyfriend of 27yrs kind of threatens me to sleep with someone else he is not sexually satisfied by me? what should I do?

We're together for 1.5 years and now I'm kinda scared that he will really really leave me even though he says he won't leave. He says he is motivating me to improve my performance in bed but can a person who loves you talk to you like that? I'm insecure in our relationship now. He justifies his words and doesn't apologize for saying it. What should I do now?

My boyfriend of 27yrs kind of threatens me to sleep with someone else he is not sexually satisfied by me? what should I do?
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