The song "Heatwave" by Hollow Coves is a nostalgic reflection on a past relationship. The lyrics describe the singer's memories of being a young boy dreaming of flying and how he would fly his plane to see his love every day. However, as time passes, they change, and the relationship eventually ends. The singer reflects on how they once professed their love for each other, but it was all just a "heatwave," a fleeting moment of intense emotion that eventually fades. Now, the singer is left standing alone, realizing that it's time to let go of the past and move on. Overall, "Heatwave" is a bittersweet track that captures the sadness and longing that comes with the end of a relationship. It speaks to the universal experience of growing apart from someone we once loved and the difficulty of letting go.