Lyric discussion by by serendipity 

Cover art for Amie lyrics by Damien Rice

I totally agree with your interpretation. Don't know if you have a big ladder of intensity in the vocabulary of relationship in English, but in French the word "amie" is very strong, I think stronger than "friend".You can tell everything to an "amie" and you know everything about her (her because "amie" with an E shows that it's a girl), as she knows everything about you. That's why I think it's the explanation of "Nothing unusual, nothing strange " : no surprise since you know each other perfectly. But it's very hard to keep this relationship intact because you grow, you change, you go away like " another soldier On the road to nowhere" I understand this song as a look on the past, when you remember (and regret) good things ( here the hopes of two young people about their futur "tell it like you still believe That the end of the century Brings a change for you and me ) and when you realize you've losted your best friends: "You know when you've found it, There's something I've learned 'Cause you feel it when they take it away"