Because if he did, he just might want to ignore the truth later down the line and he would leave Sunny to rot. Of course he would never want to do that, so why would he try to think up an imaginary world of his own? That's so selfish. How could you even think that? You're the guide. You're supposed to help Sunny find the truth. That's your purpose. Knowing the truth. Knowing the way to the truth. Always acknowledging the truth.