CORRECTTION: You were there to wear it from the start
Interpretation:
I think its about a boy who has been through many failed relationships and everytime one ends he turns to a girl thats always been just a friend for support but she's always loved him
"You strain to force a smile
The fairytale inside your head
has become your new best friend"
And then he is away from this girl (or she is away from him) when he needs her again, and without her he feels empty
"Away from you, I'm in over my head"
and he realizes how perfect this girl would be for him and he can't wait until they can finally be together
CORRECTTION: You were there to wear it from the start
Interpretation:
I think its about a boy who has been through many failed relationships and everytime one ends he turns to a girl thats always been just a friend for support but she's always loved him
"You strain to force a smile The fairytale inside your head has become your new best friend"
And then he is away from this girl (or she is away from him) when he needs her again, and without her he feels empty
"Away from you, I'm in over my head"
and he realizes how perfect this girl would be for him and he can't wait until they can finally be together