Tweetthat song sucks bro...
to answer our question-
It sounds to me like he has passed and can only look in on her through a "window" between two worlds and all she has is memories of him. His home is with her and the time frame isn't felt bc he has no time frame..he is without her and that hurts, a pain he will feel forever, thus the "Cause I'm looking at you through the glass
Don't know how much time has passed
All I know is that it feels like forever
But no one ever tells you that forever feels like home
Sitting all alone inside your head"