Having healthy boundaries means you are aware of your limits, notes psychologist Dana Gionta. Figure out where you stand, and then communicate that to your narcissist friend. For example, as you are worthy of being treated with respect, let your friend know that the next time she threatens you, you will discontinue the conversation, even if it means leaving when the two of you are at an event. She’ll either get the message that you will no longer tolerate her bad behavior, or finally make good on her threat. Either way, you’ll come out ahead.