"Cathedral" by Jade Bird talks about a past romantic relationship that ended abruptly with the protagonist leaving without any explanation. She acknowledges that she was unkind and caused the other person to lose their mind. The lyrics suggest that the protagonist knew deep down that the relationship had to end because they were both on a path of destruction, and continued would only lead to torture and regret. The song title "Cathedral" refers to a place of worship where the protagonist hears about breaking the other person's heart, possibly indicating that the relationship held a strong spiritual significance for her. The song has a melancholic and regretful tone, with the protagonist acknowledging that she has seen the light and accepts that the relationship had to end. Overall, "Cathedral" is a reflection on a troubled relationship and accepting the need to move on.