I feel like saying "Peeta fell in love with Katniss twice" disregards all the painful efforts he put into going back to being the person he was before the hijacking.
He found it withing himself to go against all the brainwashing, the painful memories, the corrupted, shiny images in his head that terrified him to his core, in order to remember who he really is and who Katniss is and why he loves her so much. And that's much more remarkable in my opinion.
He was tortured into believing lies he was never meant to oppose, but he did. He was programmed to never remember what was real again, but he did. He was convinced Katniss was evil and he should never question it, but he did.
The frustration, confusion and uncertainty he must've felt navigating through real and not real and the mental strength it takes to endure all of that and still manage to remember although he was programmed not to is the ultimate act of love and truly so admirable and fascinating.
So no, Peeta didn't fall in love with Katniss twice. That's because he refused to let his hijacked self live and get a chance to "love" her. Instead, he crawled back to who he was at his core, to the person who already loved Katniss not someone who had to learn to love her again. And he realised that the love he had then is no different from the love he has now, even after seeing Katniss's flaws. Because he was himself again. He had remembered.
"Hijacked Peeta" no longer existed anymore. There was no "Peeta before hijacking" and "Peeta after hijacking" anymore. No "Old Peeta" and "New Peeta". It was just Peeta. The Lover Boy from district 12. The boy with the bread. The baker. The painter. The one who sleeps with the windows open, always double ties his shoe laces, never takes sugar in his tea and whose favourite colour is orange. Not bright, but soft like the sunset.












