They'd both been seeing what they wanted to see, but the difference between Aphrodite's hallucination in the mist and Luke's is that Luke's was a lie, and now he has to accept it. She hates that he's having to go through this now, after being so hopeful, but she knows there's nothing she could have done to keep him from this. She hates the island right now.

"I'm so sorry, sweet pea," she says tearfully, smoothing one hand back over his temple and into his hair. "I know how much that meant to you."