If she had taken a step slower at that time, if she had apologized as usual, if she had not met him at that time, maybe she would not be where she is now.
[Indeed, we once existed so really. Whether it's sadness or joy, betrayal or love, crying or laughing, it's all evidence that we once existed. For one person, we become stronger than anyone else; for one person, we feel so weak; for one person, we want to become a better version of ourselves. Those in the past remember our existence.