Now I understood after watching and carefully listening again..
listen to the lyrics....
juda hoke bhi
tu mujhme kahin baki hai.
palko mein ban ke aansoon,
tu chali aati hai,
waise zinda hoon main zindagi
bin tere main
dard hi dard baaki raha hai seeney mein.
saans lena par hi yahana jeena nahin hai.
ab to aadat si hai mujhe
aise jeene mein.....
OMG THIS IS HIS LIFE STORY....HIS LOST LOVE STORY.....
the lyrics and dance just expressed his feelings and put it right in front of his eyes.....
Guys just listen to the whole song.....oh man....this song has even bigger meaning now after connecting the dots there.