Fear is a normal human reaction, an unpleasant emotion caused by belief that someone or something dangerous is likely to cause pain, or a threat. It is the emotional reaction to a threat, connected to anxiety and other emotional conditions, like panic and paranoia, but is a separate stand-alone emotion. Psychologists are of the view that fear is experienced as a result of teaching and exposure.
People who experience relationship fear, phobia or anxiety generally have a serious problem maintaining relationships. They may enjoy being in the relationship but become fearful and experience intense emotional dysfunction.