That's some super-late thing to say, but may someone help me understand "I can't fix you"?

Yes, i know, this song has almost one and half year, but i listened to it just today. I'm just gonna say - IT"S AMAZING. Easily no.1 from TLT songs. But that's no review post. Because i feel that i missed something that song had to say and i understood only that it was making of Ennard. Except that, barely anything.

May someone help me? And please i know i'm late so don't remind me about this!