Why do i dream about one person all the time?

The answer depends on who that person is and what that person means to you. If it is an unknown stranger, then your subconscious mind is using that person's image as a symbol for something that is constantly on your mind. Or you may be infatuated with that person, and your dreams reflect your emotional attraction. Very often, someone of the opposite sex will reflect the dreamer's own subconscious anima or animus, therefore triggering dreams. See attached sites for further information.

Cause that person is special to you .