I side with those who believe this isn't a song about one specific woman, though its story stems from the narrator's experience with one woman. It's a man's search for a woman LIKE the one he loved and lost. He keeps looking for a woman who is as wonderful as the one he lost -- "on every street" -- but hasn't found her because his lost love was one of a kind. It's a lament for the irreplaceability of the love we feel for one individual.
I side with those who believe this isn't a song about one specific woman, though its story stems from the narrator's experience with one woman. It's a man's search for a woman LIKE the one he loved and lost. He keeps looking for a woman who is as wonderful as the one he lost -- "on every street" -- but hasn't found her because his lost love was one of a kind. It's a lament for the irreplaceability of the love we feel for one individual.