The song "Cain" by EXES tells the story of a failed relationship and the lingering emotions that come with it. The lyrics describe a moment when the protagonist was on a train to meet their partner's friends and family, contemplating letting go of a part of themselves. The couple shared special memories, like listening to the song "Skinny Love" and dancing until the sun came up. The song also highlights the significance of a particular room where the protagonist met their partner's mother and where their relationship almost blossomed into something more. The room holds emotions and memories that still resonate with the protagonist, as they could feel their partner's presence in that space. However, the song also expresses the regret and longing for what could have been. The protagonist acknowledges that they will never have the opportunity to hold their partner's hand again or to have another chance with them. The passage of time, represented by the year spent in London, only serves to further deepen the memories and intensify the connection to the past. Overall, "Cain" is a poignant reflection on lost love, missed opportunities, and the persistent feelings that can remain even after a relationship has ended.