I know the song isn't about a pair of girls, but I decide that now: it's about two girls. Let's call them F and A just to make it easier. They have fought about a boy and doesn't talk to eachother.
The video starts in the morning.

F opens the refrigerator and you see lots of pictures of her and A.
A takes the keys and drives her vespa.

F is on the bus, it's still morning.
You see flashbacks from the time before the fight. 

You see flashbacks from the fight.
You see when F ignores A's calls. (When the song goes "You never returned that call") 
And in the end F stands at the platform and the trains are going past her and A steps out of one. Then F stops her and mimes with the lyrics "I don't mind, if you don't mind. 'Cause I don't shine, if you don't shine".








