Big Sur is riddled with what Kerouac calls "signposts" of death, often in the form of dead animals or, in one instance, in the form of a sick friend. In recognizing the mortality of other living beings, protagonist Jack Duluoz must constantly deal with his own mortality, a task made more difficult by his alcoholism and delirium tremens. "Everything is death," concludes Jack at one point in the novel.
Jack is interested in Billie – and in love in general – only because it distracts him from his obsession with mortality.