First off, its a kid who's band is making it big and he comes back on a flight to break up with his girl because he doesn't think he can handle both and chooses his music career. When he thinks back on it he really regrets it, because he knew her so well after being invested for so long before everything.
Secondly, this kid expresses how he was "always in a way just a long shot" and "I am lucky just to be a potential" expressing how he never thought he'd really make it in music.
Song has two concepts I believe-
First off, its a kid who's band is making it big and he comes back on a flight to break up with his girl because he doesn't think he can handle both and chooses his music career. When he thinks back on it he really regrets it, because he knew her so well after being invested for so long before everything.
Secondly, this kid expresses how he was "always in a way just a long shot" and "I am lucky just to be a potential" expressing how he never thought he'd really make it in music.