According to Dream Dictionary Now, dreaming about someone typically means the dreamer is thinking about that person frequently in real life. Because dreams reflect the thoughts and emotions of the dreamer, a dream about someone reflects strong feelings towards that person. A person in a dream can also demonstrate an aspect of the dreamer's personality.
A dream about someone can indicate that the dreamer should tell that person how he feels about her. Positive dreams about someone are sometimes a message from the subconscious to open up with that person, or a reflection of the dreamer's desire to be with that person. Dreaming about a person multiple times could indicate that the dreamer has not been open about his feelings for that person.
Negative dreams about someone, particularly dreams about rejection from that person, can reflect the dreamer's anxieties and insecurities. Dreams of violence towards someone can reflect hostile feelings towards that person. Dreams of being chased by someone can mean the dreamer sees that person as a threat, or the chaser could be a symbol. The meaning of the dream varies based on the dreamer's relationship to the person and the circumstances of the dream.
Dreams don't always have meanings. One superstition claims that dreaming of someone meant that person being dreamt about is thinking of the dreamer, but there is no evidence that this is true.