@Vasqueztion Nah, I don't think he's immune. We saw him getting hurt. I reckon he merely meant that he immediately guessed she's lying about the cure, yet he still did play along with her test till the end. So, he was testing how bad she would feel about lying to him, which in turn reveals how genuine her feelings are. After all, she could be dating him because she feels like she has to pay him back for having to endure the curse, or, perhaps, because she feels like nobody else would stick to her despite the curse. In either of those cases, I don't think she would have reacted this strongly.