“You see her when you close your eyes
Maybe one day you'll understand why”

Passenger – Let Her Go Lyrics on LyricsMode
EXPLANATION
He can't stop thinking of her and he doesn't know why.
EXPLANATION
You'll just realize everything that she did but It's too late.
EXPLANATION
But it's to late to do anything because he let her go without telling her how much he loved her and how much she meant to him. We take things fo granted most of the time and never realize how much pain we cause to the people that loves us and we love.