“He had felt sorry for his mother and she had made him lie. He would go to Kansas City and get a job and she would feel all right about it. There would be one more scene maybe before he got away. He would not go down his father’s office. He would miss that one.He wanted his life to go smoothly. It had just gotten going that way. Well, that was all over now, anyway.”
Hemingway, Ernest. In Our Time. New York: Scribner Paperback Fiction, 1958. p77.
Harold makes the decision to leave quite quickly and just wants to escape; he doesn’t want to pretend anymore.