In fact, 'Dear John' isn't based on reality. It's a creation of the author's mind, crafted to entertain and move readers through a made-up narrative. But that doesn't mean it can't evoke powerful feelings and thoughts in us.
Well, 'Dear John' is purely fictional. The plot and characters were developed by the writer to tell an engaging story rather than being inspired by real events. However, sometimes fictional stories can touch on universal themes and emotions that make them feel relatable.