Every time I came to the end of a block and stepped off the goddam curb, I had this feeling that I'd never get to the other side of the street. I thought I'd just go down, down, down, and nobody'd ever see me again... I started sweating like a bastard--my whole shirt and underwear and everything... Every time I'd get to the end of a block I'd make believe I was talking to my brother Allie. I'd say to him, 'Allie, don't let me disappear. Allie, don't let me disappear. Allie, don't let me disappear. Please, Allie.' And then when I'd reach the other side of the street without disappearing, I'd thank him.
Consider how Holden has (or has not) changed over the course of the story. What does the above narrative reveal about Holden's trajectory as a character?