In "P.S. I Love You," author Cecelia Ahern explores the themes of love and loss through the journey of moving on after a significant relationship. The protagonist learns that rather than shying away from the memories of love, one can embrace and honor those feelings. Celebrating past love can be a path to healing, allowing individuals to cherish the positive aspects of their experiences.

Ahern's message encourages readers to find strength in their past, suggesting that memories of love should not be a source of pain but a testament to the joy once shared. This perspective promotes a healthier approach to grief, advocating for an acceptance of love's enduring impact even after it has changed form.