Autophobia

Background
Autophobia (or Monophobia) is the phobia of being alone. The word is derived from the Greek words autos ("self") and phobos ("fear").

Many people who fear being alone also fear being unloved, unwanted, or unrecognized. This fear often leads sufferers to enter into and remain in multiple, chaotic, and destructive social relationships. It can also lead them to engage in codependency and self-destructive behavior, as well as continued and prolonged isolation from others.