For you I was a flame
Love is a losing game
Five story fire as you came

from Amy Winehouse – Love is a Losing Game Lyrics on Rap Genius

Amy is suggesting when she was with him,she was the best she could be in her personality, relationship and herself .

referring herself to a flame. she is saying she is dangerous but not too dangerous to cause damage or hurt meaning in her relationship and to him. the last line shows, if you add everything into the equation, its enough to cause real hurt and damage

she knows her love means nothing to him, therefor making it a looing game.

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