This song is about commiting suicide (I suppose it's the most romantic way to die... ^_^')

these are the lyrics that prove it
This is your last night,
Suicide kept tight,
You're gone tonight.

I think it means that he left her and is wondering how she's doing. Meanwhile, he feels perfect while she's numb inside to the point where she cries over him. You have to really love someone to cry over them.

Just what I think.