My boyfriend jokes about cheating with my best friend. I don’t know what to do?

My boyfriend constantly jokes about sleeping with my best friend but says it’s a joke every time and says he will never do that. He joked about how he has already slept with her before in the past (she knew him before I met him). He joked about how even if they slept together she wouldn’t tell me and neither would he. It’s all jokes jokes jokes but if I was to joke about something like this it would be world war 3.

My boyfriend jokes about cheating with my best friend. I don’t know what to do?
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