Why do narcissist move on so easily?

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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.

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.

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

Do you stay in the theater long after the movie ends, or sit on a stopped train when everyone else has left?

It’s time to get off and move on.

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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.

What would happen if the Soviet Union had simply annexed Manchuria after World War 2 or kept it independent as a puppet state allied them and separate from China as China was too weak too oppose it anyway?

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.