That diary is the third lead of the film. It is the physical manifestation of memory. It is proof that what they had was real. When Allie has her moments of clarity (the panic, the screaming, the heartbreaking "I’ll be back to you in a minute"), she is fighting against a disease that wants to erase her identity. The diary is her anchor.
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For the uninitiated, Un Diario De Una Pasión (The Notebook) tells the story of Noah Calhoun and Allie Hamilton. They are the original blueprint for “opposites attract.” She’s a wealthy, polished city girl. He’s a poor, sawdust-in-his-hair country boy. They spend one perfect, explosive summer together in Seabrook, only to be torn apart by class, war, and parental meddling. Un Diario De Una Pasion
Two hours later, you are sobbing into a pillow, clutching your heart, wondering why real life doesn’t come with a soundtrack by Aaron Zigman. That diary is the third lead of the film