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On Valentine's Day Lexie volunteers to watch Zola for Meredith and Derek; Callie plans an evening for Arizona; and Ben shows Bailey how much he cares. Meanwhile, Christina and Owen drift farther apart despite the fact that he saves her when a car crashes into the hospital. Meredith and Bailey treat a woman who has headaches and seizures. Webber and Lexie treat a man who was hit by a car during a fight with his girlfriend. Alex treats a 10-year-old girl who has a severe reaction to peanuts when her boyfriend gives her a Valentine's Day gift.