And when I fell hard
you took a step back
Without me, without me, without me
And he's long gone
when he's next to me
And I realize the blame is on me
This should not be treated as a single sentence, but as two different sentences. In the first the singer narrates past events in the past tense; in the second she tells the present outcome of those events in the present tense.
Note the marked change in the melody between the first "sentence" and the second; and note that the entire song (and its spoken intro) moves back and forth between past and present.