Dreams about footwear, especially boots, often symbolize your journey or direction in life, as well as the choices you make. In your dream, the missing boot may represent a feeling of incompleteness or something in your life that feels unresolved. The act of needing to ask your ex-boyfriend for the second boot suggests that there are unresolved feelings or past experiences that you may need to confront in order to move forward.

The fact that he didn't recognize you could indicate a sense of disconnection or a feeling that your past is distant from your current self. It may also suggest that there are aspects of your past relationship that you need to integrate into your present life to feel whole.

Consider reflecting on your current situation and relationships. Are there any unresolved feelings or lessons from your past that you need to address? This dream might be prompting you to seek closure or understanding from your past experiences to help you fully embrace your present and future.