The fear of people leaving you, also known as abandonment anxiety or separation anxiety, is a common fear that people experience. It is the fear that someone you care about or depend on will leave or abandon you, either physically or emotionally. This fear can be caused by a variety of factors, including past experiences of loss or abandonment, low self-esteem, and attachment styles formed in childhood. It can manifest in different ways, such as becoming overly clingy, avoiding intimacy, or feeling anxious and insecure in relationships.