Who said "I should never have let you go"?

This quote is attributed to Peeta Mellark.

I should never have let you go - Peeta Mellark

"I should never have let you go"

Peeta Mellark

Character in Catching Fire

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"I can't help how I feel about you. I can't help anything."

"I'm in love with you. I'm sorry."

"What I need is the REAL you."

"I'll be waiting, though. If you change your mind."