What is the theme of Everytime by Britney Spears?

"Everytime" by Britney Spears explores the theme of regret, loss, and the emotional toll of a failed relationship. The lyrics portray a sense of longing and nostalgia, as the singer reminisces about the past and expresses her deep sorrow over the end of a significant relationship. Spears sings about the constant pain and hurt that haunt her, making it difficult to move on and find solace. The theme revolves around the concept of longing for a time when things were different and the desire for a chance to turn back the clock and change the outcome of the past.