How is “a slap in the face” used?

In The Aviator (2004), one line is: “Every time there's a picture of you with another woman, it's a slap in the face.”

Which movie is “a slap in the face” from?

The clip at the top of this page is from The Aviator (2004).

Modismo

an action that seems to be intended as a deliberate insult to sb

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Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

Every time there's a picture of you with another woman, it's a slap in the face.

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