It is about her "first horrible heartbreak." according to Sara Bareilles herself and later featured in 'So You Think You Can Dance' Series 5 where the choreographer Mia Michaels used it to depict the problem of "Addiction" in general. it was also used in episode two of 'The Vampire Diaries' when Elena and Stefan share their first kiss, and in the 'Community" episode "Paradigms of Human Memory", where it was used to…
Something always brings me back to you.
It never takes too long.
No matter what I say or do I'll still feel you here 'til the moment I'm gone.