Meaning of "You've Changed" by Sia

The lyrics of "You've Changed" reflect a story of personal growth and transformation. The singer describes how the person they are addressing used to be someone who played around with emotions, stealing hearts and engaging in fleeting romances. However, upon entering a relationship with the singer, the individual has undergone a positive change for the better. They have transitioned from someone who made waves and caused heartache to being supportive and loving, particularly towards the singer. This transformation is highlighted as being significant, as the repeated chorus emphasizes the change for the better. The song speaks to the idea that people have the capacity to evolve and become better versions of themselves, especially in the context of love and relationships.