If you are behind something or someone in a dream, then it means you are looking for acceptance and support from those around you. The dream also shows the lack of security feeling you are suffering from. On the other hand, the dream may symbolize the thoughts that are coming out from the subliminal mind of yours. If someone has left you behind, then it foretells about the declination you are suffering from. There is also possibility that you find it hard to adapt on various circumstances. Mostly of the time you are trying to find of who you are, and how dormant you are. If you were the one who left someone behind, then it denotes to the past you were able to forget.
Read more about dreaming of Behind in other dream meanings interpretations.