"Only One" by Carlie Hanson is a song about a complicated relationship where the protagonist is reluctant to be alone. They long for the presence and attention of their partner, expressing their need for emotional support and companionship. The lyrics convey a sense of longing and vulnerability, as the protagonist acknowledges that they may not be the only person their partner seeks comfort with. The song highlights the dynamic between the protagonist and their partner, emphasizing the unique understanding and closeness they share. The protagonist claims to be the only one who truly knows and understands their partner, referencing the experiences and moments they have shared together. Despite the uncertainties and possible infidelity within the relationship, the protagonist still yearns to be reunited with their partner. They express their commitment to protect their partner's heart and the desire to start again from the beginning. The lyrics also highlight the memories and experiences shared by the couple, emphasizing the love they once had for each other. The protagonist reminisces about the love they shared without reservation or caution, implying that their love was intense and all-encompassing. Overall, "Only One" portrays the complexity of a relationship where trust and emotional connection are paramount. The song captures the protagonist's desire for emotional intimacy and the struggle to maintain their bond despite the challenges they face.