The song "Must Be Love" by Christina Grimmie tells the story of unexpectedly falling in love. The narrator starts off at a mall with friends, contemplating leaving town and running away. However, everything changes when the person they eventually fall in love with walks in. The moment their eyes meet, time seems to freeze, and the narrator's heart skips a beat. They compare this feeling to a rock rolling down a hill and a car without a driver, indicating the uncontrollable and overwhelming nature of love. The narrator originally had no intentions of getting involved with anyone, focusing on their work and staying busy. But now, they can't stop thinking about this person, wanting them to leave their head and be by their side. Once again, everything freezes with just one smile from the person they're falling for. The lyrics suggest that love has taken over their heart and body, making them feel unwell, almost as if they need medical attention. The chorus repeats the idea that it must be love, emphasizing the deep certainty they have about their feelings. Love has infiltrated the narrator's chest and bones, making them feel unprepared for this intense emotion. They have images and thoughts of the person flashing in their head, understanding that something is wrong but not wanting to leave them alone. Love has completely enveloped them, leaving them unable to explain or control it. Overall, "Must Be Love" portrays the experience of unexpectedly falling in love and the overwhelming and uncontrollable nature of those emotions. The song captures the narrator's surprise, confusion, and certainty about their deep affection for someone they never anticipated meeting.