There is a pronounced difference between being alone and being abandoned. Being alone can be an intentional choice by the dreamer. This usually means finding a time for personal reflection and inner growth. The waking equivalent is the cocooning phenomenon. People are staying home more-regrouping and rebuilding their inner strength.
Aloneness may herald transition or rites of passage. When we move from childhood to adulthood, there are habits, attitudes, and relationships that are left behind. This void can create an image of aloneness. Dreams like this often present themselves as the dreamer traveling somewhere alone. Who is separating from you, and why, in waking life? Is this mutual, at your initiative, or another's wishes against your will?