The guy in the song obviously is crushed and hurt, he is unable to feel anything but pain, so to make life bearable he became tolerant to it and constantly adapts it as his persona. He meets a girl who he wants to change his life, the last 2 lines of the song "I know how to feel You're the only way that I know how to feel" is a turn around, he only feels anything but pain when ever she is there.
The guy in the song obviously is crushed and hurt, he is unable to feel anything but pain, so to make life bearable he became tolerant to it and constantly adapts it as his persona. He meets a girl who he wants to change his life, the last 2 lines of the song "I know how to feel You're the only way that I know how to feel" is a turn around, he only feels anything but pain when ever she is there.