All tagged what's the meaning

What does "Water under the Bridge" by Adele mean?

SONG MEANING: "Water under the Bridge" is about someone breaking up with Adele. She doesn't want the relationship to be "Water under the Bridge" and wants him to admit that it is and was real. Adele is slowly teasing and releasing songs from 25 until she releases the entire album tomorrow, and yesterday she teased a 30 second clip of her singing one song--"Water under the Bridge"--in New York's Radio City Music Hall. The lyrics also went up all around the Internet, so I'm ready to explain them. The music and her voice will, I'm sure, add new levels and depths of meaning when we have them, but for now, here's what the lyrics mean.