A teenage boy gets beaten and left for dead he has outer body experience and goes to school like nothing ever happened then realizes that know one can see or hear him then he is able to talk to a girl she can't see him but can hear him she helps him find his bodt and in the hospital she gives up her life for him to live

The Invisible (2007)
IMdb synopsis:After an attack leaves him in limbo~invisible to the living and also near death~a teenager discovers the only person who might be able to help him is his attacker.

The Invisible (2007) - IMDb (http://www.imdb.com/title/tt0435670/)