Though the To All the Boys I Loved Before films definitely focus on Lara Jean and her internal journey — even using her narration to tell the story — Peter has become one of the most crucial and pivotal characters in the series. As a result, while Lara Jean has to make an enormous decision about her future and whether she wants to go to college in New York or California, Peter must also grapple with Lara Jean's choices... and reconcile with his father.
During the class trip to New York, where Lara Jean finds independence outside of her relationship, Peter is clearly concerned and feels left behind; as a result, when Lara Jean tries to seduce him after their senior prom, he admits that he's devastated, and breaks up with her.
However, an unlikely figure helps Peter figure out what he really wants: his father, who left his mother and started a new family when Peter was young. After begrudgingly reconciling with his absent father, who tells him that love means doing whatever you can to keep the one you love in your life, Peter realizes what he must do. Ultimately, he writes Lara Jean her own love letter and tells her that the distance is no obstacle, and they agree to stay together. There's no question that Peter makes this decision because of his love for Lara Jean, but it also shows major growth for him as a character; he's willing to compromise and stray from his rigid, Stanford-only plan for somebody that he loves, just as he's willing to accept his father back into his life after years of resentment. Now more than ever, Peter is ready for a real, adult relationship — even one that spans thousands of miles.
