Instructions: In this task, you're given a context passage. Your job is to generate relevant questions that can be answered by directly referring to the passage.
Input: But despite the logic his teacher attempted to bring into the matter , and even after her parents urged Miyagi to move on and forget about her -- he never did . After her death , he began building up a wall between himself and others . He viewed the world in complete indifference , going with the flow of things . His marriage was brief and unsuccessful , it resulted in a divorce when his wife cheated on him and left him . After the break - up , she confesses to Miyagi that she truly had loved him .
Output:
What may have caused him to build up a wall between himself and others ?