What does it mean when you dream of a person you have never met in life?

It Could probably mean that you wished this person was real because you haven't seen anyone cute so you made a person up in your dreams then when you wake up you meet them

Another answer:

The images in dreams come from the dreamer's subconscious mind. You see countless people in public places, on TV and in other media that you don't notice consciously, yet the subconscious mind records their impression. So it is not unusual to encounter someone in dreams that one does not remember meeting in real life.