“Well you see her when you fall asleep
But never to touch and never to keep
'Cause you loved her too much and you dive too deep”

Passenger – Let Her Go Lyrics on LyricsMode
He dreams of this woman when he is sleeping, but in real life he doesent have her. its just a fantasy of what he wants. he relizes that he loves her so much, but he jumps into the love to fast and to hard. and by doing this, it will never work. he understands this fantsay image of him and this woman is to unreal and he is dreaming to big.