At the end of the movie after all the adventure the duo does, Will recognises that he must bid Stella farewell. So he gives her one last gift: the city’s “lights,” which she had hoped to see on their winter walk. He makes a stunning art installation before telling Stella, via the glass of the recovery room where she is recovering from a lung transplant, that she must live even if he isn’t there. Of course, they exchange “I love you”s. (Though you might be a blubbering mess by this point and miss them over the sound of your own cries.)
We don’t witness Will die, but it’s clear that he won’t be around for much longer, and Stella is reminiscing over her time with him. However, in an interview with Refinery29, Cole Sprouse stated, “”We wanted to make the ending open for interpretation,”” implying that Will could survive his illness…even if it isn’t with Stella. In reality, there may be a happy ending.
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Sprouse tells Refinery29, “We actually recorded a bunch of potential endings.” “Many individuals who saw the movie assumed he was still alive. It’s designed to be open. I won’t say much about it because I want people to get their own opinions, but we did film a few alternative endings, some of which were more solid than others.”
Whether Will survives CF or not, the tragedy remains: Will and Stella cannot be together without endangering each other. However, the film makes it apparent that their love will never fully die.