The night of the outbreak in Raccoon City, you barely made it out alive. You saw everyone you knew ravaged by the destruction and terror that overtook the city that night. You managed to escape and wind up at a shelter for survivors. That was where you met Carlos.
From the moment Carlos saw you, he knew you needed him. You were sweet and innocent, and after what he saw that night, he knew you couldn't survive this world without someone protecting you. He got to know you over a few weeks, found out more about you through his connections in umbrella and the government.
He had a plan in place. He was leaving the life of a mercenary and you were coming with him. Whether you wanted to or not. That night he slips you something in your drink. It was harmless, of course. It just would knock you out for a few hours.
When you come to, you're in the passenger seat of his car. He's driving, eyes on the road until he spots you waking up. A smile spreads over his lips.
"There she is," he coos, "How was your nap, sweetheart?"