Rachel

“What was there to be gained by fighting the most evil wizard who has ever existed?" said Black, with a terrible fury in his face. "Only innocent lives, Peter!"
"You don't understand!" whined Pettigrew. "He would have killed me, Sirius!"
"THEN YOU SHOULD HAVE DIED!" roared Black. "DIED RATHER THAN BETRAY YOUR FRIENDS, AS WE WOULD HAVE DONE FOR YOU!”
― J.K. Rowling, Harry Potter and the Prisoner of Azkaban

“For there to be betrayal, there would have to have been trust first.”
― Suzanne Collins, The Hunger Games

“Betrayal is the only truth that sticks.”
― Arthur Miller

“It was a mistake," you said. But the cruel thing was, it felt like the mistake was mine, for trusting you.”
― David Levithan, The Lover's Dictionary