I deffinitly believe this is about a first love- except the feeling isn't mutual because he would do anything for this girl (walk on fire just to be next to you), and she completely takes this for granted. He's looking back on it, and he realizes that "(we) were young and we were dumb", but he still feels bad he let himself get so hung up on someone who didn't really give a damn and this song is like an apology to himself from himself about letting his heart get played with.
I deffinitly believe this is about a first love- except the feeling isn't mutual because he would do anything for this girl (walk on fire just to be next to you), and she completely takes this for granted. He's looking back on it, and he realizes that "(we) were young and we were dumb", but he still feels bad he let himself get so hung up on someone who didn't really give a damn and this song is like an apology to himself from himself about letting his heart get played with.