And that was that - he wrote the song the next day.
Also, I think the song can just be seen in a way that says everyone needs fixing in some way, nobody's slate is ever clean. So maybe it's a song about a relationship that's struggling and how, despite the many mistakes we make in life that hurt the ones we love, the people you love fix you.
Fix You could be the anthem for most men in relationships. The need to try and fix the problem of someone you love rings out in this song. To see someone you love hurting causes pain and frustration, and for most men there is an intense desire to try and fix the problem. Sometimes that is not possible and that theme shines clear in the lyrics of the song when chris said ‘And I will try to fix you.'