Maybe the song is about Marilyn's affair with Kennedy. He was ashamed of her, denied their relationship, her bad, slutty side which would people think of if they understand about their affair. So she decided "if you can't handle my worst (bad things people would think about them) you ain't gettin' my best (her love)".
Maybe the song is about Marilyn's affair with Kennedy. He was ashamed of her, denied their relationship, her bad, slutty side which would people think of if they understand about their affair. So she decided "if you can't handle my worst (bad things people would think about them) you ain't gettin' my best (her love)".