My first Idea

Content :

First Idea :
He sings about Kathleen and that he loves her but it seems that she is not good for her. Like Eoghan has said Kathleen seems to be an object. I imagine that he sings about a drug. I know this would be very hard for a musicvideo but it was the first thing that came into my mind.

This would also fit to the lyrics, espacially these lines :

When I woke after sleeping, knowing you would be gone  
He is not high anymore

You freed me from language
She (the drug) makes him free and she seems to be the only one who can do that with him

You keep leaving this town, always bringing me down, I don’t love you Kathleen.
In the end, he admits that she is not good for him

Seccond Idea:
He fell in love with a prostitute that doesn't love him back. By telling himself "I don't love you", je tries to convince himself that he does not love and need her, but in fact he is  addicted to her.

Effects:
I really would recommend to have lyrics in the video (kinetic ones, like the one in the "Here I go" Video or in the one I have posted.  Another effect we could use is the overlaying of videos via masks ( Like in the "diamond eyes " video). I would shoot it in a studio with a black background and everytime this "oooooh" comes, we could use that effect.