If you didn't left

I’m staring at you’re picture
I’m staring at the wall
I've never thought of this
How far I would fall.

Haven’t seen you in a while
And the days passed,
But after all this time
The feeling last.

So quick gone,
And left me behind
Was it so hard?
To stay out of my mind

I guess it is
‘cause I just can’t see
If you didn’t left
Then where were we?