I doubt it's about a relationship. I think it concerns a guy who became such close friends with someone, that they were like twins. They had a history of trials and tribulations. When they took their separate roads, one took the high road of possibly religion and success as the writer took the low road. When the writer saw him again, he felt a little bit of betrayal, loss, and hopelessness. He tried the remember the person he used to love who was closer than a brother, and couldn't feel anything but pain. The final bridge of the song is the writer lashing out with harsh words. Pretty much saying that even though you took the high road, you've still lost (which I'm sure the writer is aware of how wrong he is considering he's about to give up on life).
I doubt it's about a relationship. I think it concerns a guy who became such close friends with someone, that they were like twins. They had a history of trials and tribulations. When they took their separate roads, one took the high road of possibly religion and success as the writer took the low road. When the writer saw him again, he felt a little bit of betrayal, loss, and hopelessness. He tried the remember the person he used to love who was closer than a brother, and couldn't feel anything but pain. The final bridge of the song is the writer lashing out with harsh words. Pretty much saying that even though you took the high road, you've still lost (which I'm sure the writer is aware of how wrong he is considering he's about to give up on life).