Who said "I really did."?

This quote is attributed to Holden Caulfield.

I really did. - Holden Caulfield

"I really did."

Holden Caulfield

Character in The Catcher in the Rye

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"It kills me. It really does."

"I'm the most terrific liar you ever saw in your life."

"Phoniness kills me. It really does."

"I really do. That's the thing about me. I'm quite the sexfiend."