How did David's relationship with his dad change in Chapter 5?

In Chapter Five, David's father ceased being his hero. His days of making everything alright officially ended, his care and protection ended, and David's respect for him..... it ended. David's mother had just stabbed him, and his father told him to go away before she found out they were talking.

As I stood before Father, not knowing what to do next, I looked down and saw droplets of blood staining the family’s carpet. I had felt in my heart that he would scoop me up in his arms and take me away. I even imagined him ripping off his shirt to expose his true identity, before flying through the air like Superman.I turned away. All my respect for Father was gone. The savior I had imagined for so long was a phony. I felt more angry at him than I did at Mother. I wished that somehow I could fly away, but the throbbing pain brought me back to reality.