Told my bf he wasn't the best in bed.. how do I fix things?

I was super honest with my bf because that's what he wants. He'd rather live with the truth than a lie. So I told him he wasn't the best ever in bed. Now he thinks of himself as a failure and thinks he will never live up to my past. How do I make him see he can and will?
Told my bf he wasn't the best in bed.. how do I fix things?
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