Pour (Rub) Salt into (on) the Wound (an open wound)

What does the idiom “Pour (Rub) Salt into (on) the Wound (an open wound)” mean?

Definition:

Worsen an insult or injury; make a bad situation worse for someone

For example:

“Breaking up with George was bad enough, but seeing him out with Carla just poured salt into an open wound.”

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