Quote 19
"He's the only one would ever let me. Let me hug him on cold nights. I saw a place in Mexico. With horses. By the sea" (11.10).
When Holly's ties to the happy parts of her past disappear, it destroys her. Fred was her one constant link to a past she remembered fondly, and his death erases that for her in an instant.
Quote 20
"I'm very scared, Buster. Yes, at last. Because it could go on forever. Not knowing what's yours until you've thrown it away" (18.18).
Holly has spent her life avoiding anything permanent, but as she heads to the airport she finally admits that this impermanence scares her because she sees no end to it. The idea of transience stretches before her indefinitely.
Quote 21
"I don't. I'll never get used to anything. Anybody that does, they might as well be dead" (3.12).
The idea of staying put feels like a death sentence for Holly. To her, life is about continuing to move and to experience new things. She doesn't believe in staying in one place long enough to get used to it.