Why? What did Katniss do to him? <--
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Chapter please, and what do you mean about getting Katniss "back"?
Are you talking about when he threw the bread outside to her, and saw her all the time but never talked to her. So now he feels like he lost her and he wants her back so they put on an act (which is an act to Katniss but not to Peeta) to get her back.