Betrayal is Insidious
After having her brain eaten twice already in the Dreamworld, her mental faculties had severely deteriorated. Now, she could not think for herself. She could no longer think reasonably. From this moment forth, she would live inside her own delusions.
Every time her brain was eaten in the Dreamworld, she would lose a part of herself in the Waking World. And eventually, she would completely lose herself and turn brain-dead.
This was what Bryan was aiming for from the very beginning. If things that happened in the Dreamworld caused ripple effects in the Waking World, then he would covertly ruin Celine's life.
He would make Ron go through the pain of losing his loved one, just like he had lost Henry, Emma, and his teacher. He would take everything away from Ron and make him beg for death!
As Celine and Ron were intensely quarreling with each other, they didn't realize that a small black cat was staring at them through the window. The cat was looking at them with an amused smile.