she's saying that her life was kinda low and not where she wanted it to be. she saw it from an angle that kinda made everything seem sad. but then this person comes into her life and makes her see things in a different perspective.. one that she likes. "and i will learn to say good-bye to yesterday" suggests that she maybe had a problem with dwelling in the past. it's basically a song about someone making her see life differently.
she's saying that her life was kinda low and not where she wanted it to be. she saw it from an angle that kinda made everything seem sad. but then this person comes into her life and makes her see things in a different perspective.. one that she likes. "and i will learn to say good-bye to yesterday" suggests that she maybe had a problem with dwelling in the past. it's basically a song about someone making her see life differently.