i think it's about a girl the speaker is fascinated with, a girl who's independent and aloof, "under lock and key" a "sovereign" nation. she's been through a lot in this town ("stay brave if your arbors fall) and needs to leave. the speaker is lamenting this fact, but realizes that she is unreachable emotionally if not physically and accepts it because he's "never been a thief" and leaves her to her sovereignty.
i think it's about a girl the speaker is fascinated with, a girl who's independent and aloof, "under lock and key" a "sovereign" nation. she's been through a lot in this town ("stay brave if your arbors fall) and needs to leave. the speaker is lamenting this fact, but realizes that she is unreachable emotionally if not physically and accepts it because he's "never been a thief" and leaves her to her sovereignty.