What does it mean when you dream about someone who is following you?

It means your are dreaming. dreams dont actually have meanings.

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Dreams are produced by the subconscious mind of the dreamer.

To dream that someone or something is in pursuit of you, indicates that you are refusing to acknowledge a certain viewpoint or idea.

To dream that you are in pursuit of someone or something, suggests that you are being denied of your power and influence. You need to re-evaluate your strengths and concentrate your efforts in something more worthwhile.