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As it happens, you don’t have to be a secret agent leading a double life to keep things interesting (though it helps if you are).

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When your partner asks about your exes, do not engage. Abort mission.

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A little contrariness is good. But when you can’t get through an afternoon meal without them wondering why you’d use spinach instead of kale for the side dish, and then they go on to talk about how much better kale is than spinach, it’s time to re-think this entire relationship.