Peeta softens his voice a little. "I want you to have it, Sansa, because I like doing nice things for my friends. It doens't do me any good just collecting dust and it's something pretty that might make you happy. That's more than enough to make my decision for me."

Maybe he's overstepping a little, calling her a friend, but Peeta likes her and feels strangely protective of her, even if she might not need it or ask for it.