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I owe you nothing. And you are nothing to me. Thank you for curing me of my ridiculous obsession with love.
— Christian • Moulin Rouge!

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker insists there is no debt and no remaining attachment, then offers a bitter thank-you for being 'cured' of love. Calling it a ridiculous obsession changes the language of affection into the language of an ailment. The gratitude lands as an accusation.
Context reviewed