Why do narcissist move on so easily?

Narcissists move on so easily because they’ve gotten what they wanted from you. Once they’ve taken what they needed, they look for someone else who can offer something new or better.

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All the sweet, long-term promises were just to keep you quiet. The narcissist had a shallow, specific goal in mind, and it had nothing to do with love or idealization. Those were just illusions.

You might have been their practice partner for a skill they wanted to learn, a place to crash while they figured out their next step, or someone attractive to show off in front of their ex. Whatever it was, the ride is over.

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Or keep holding onto a banana peel all day after you’ve eaten the fruit?

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It’s like finishing a meal—do you put the empty packaging back in the fridge after eating the steak?

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It’s time to get off and move on.

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No, you don’t. You got what you wanted, and you move on. There are plenty of other things you still want, and you know you won’t find them all in one place.