This post was inspired by a striking passage in Jonathan Stroud's fantasy novel The Amulet of Samarkand, the first in the series that features magic, alternative history and the amusing djinni or demon Bartimaeus.
Here, the young apprentice magician Nathaniel mentally disowns his master, opts out of his position and transfers his allegiance elsewhere:
“...Nathaniel did not regard Arthur Underwood as his true master any longer. His masters were the magicians of old, who spoke to him through their books, allowing him to learn at his own pace and offering ever-multiplying marvels for his mind. They did not patronize or betray him.
Arthur Underwood had forfeited his right to Nathaniel's obedience and respect the moment he failed to shield him from Simon Lovelace's jibes and physical assaults. This, Nathaniel knew, simply was not done. Every apprentice was taught that their master was effectively their parent. He or she protected them until they were old enough to stand up for themselves. Arthur Underwood had failed to do this.”
This is a very good description of what can happen internally when someone permanently loses respect for and faith in the authority figure – or parent – they are dependent on. They may indeed mentally reject and disown the person who has let them down so badly.
A disillusioned victim of betrayal who has no other options in the real world may try to fill some gaps by reading. If they can't get what they need, want and expect from the people around them, they will turn away from them and get it from the world of books instead.