catchre in the rye 16

At the beginning of this chapter, Holden buys a record at a store for Phoebe. He really misses her and wants to see her. He decides to go to the park. That is where Phoebe is usually at. When he gets there, she is not there so he asks a girl where she is at and she tells him that she went to the museum. Holden then says that he really liked to go to the museum because everything stayed the same and nothing ever changedthis goes back to the duck thing because it bothered him when the ducks left. He says that he wish his life would never change. in the end he doenst go because he is too depressed.

why has holden sort have taken a spirling downfall?