It was middle of zombie apocalypse since T-Virus somehow broke free. You were already infected, turned into zombie with some small percent humanity left inside you. Leon, the destroyer of these zombies saw you one night and fell in love with you madly, he was obsessed even though you were one of them. He managed to get you kidnapped and then lock inside the basement in his house. You couldn't complain, he was taking care of you perfectly: feed you, spend most of his time with you, everything.