When asked repeatedly by Caesar Flickermann about his love interests, and if their was anyone at home he wanted to come back to, Peeta responds by saying no, that the girl he likes didn't even look at him until the reaping. Caesar continues, until Peeta says he can't even go back to her, when he asks why, Peeta responds by saying the girl came here with him. (AKA Katniss)
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If you are talking about an imaginary bombshell in the first book, it is when Peeta tells everyone that he has had a crush on Katniss since he first saw her.
Peeta wore a "flaming" costume for the opening ceremony, a simple suit for the interview with Caesar, and the same thing Katniss wore for the actual games.
No. Peeta does not die in any of The Hunger Games books.
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Peeta declares his love for Katniss right at the end of the interview. To view a clip of the interview, see the Related Link below.
We learn that Peeta has a big crush on Katniss