i think when she sings "well sometimes i think that i'm bigger than the sound", it means that there are moments wherein she feels that life has something better planned out for her than the screwed up relationship she can't seem to put behind her. it seems to me like she feels she shouldn't have settled for something less than what she deserved, but she made a choice and can't break away from that commitment. whether she can put it behind her or not, she's already been marked by that experience. that's why the rings are saved instead of thrown away.
i think when she sings "well sometimes i think that i'm bigger than the sound", it means that there are moments wherein she feels that life has something better planned out for her than the screwed up relationship she can't seem to put behind her. it seems to me like she feels she shouldn't have settled for something less than what she deserved, but she made a choice and can't break away from that commitment. whether she can put it behind her or not, she's already been marked by that experience. that's why the rings are saved instead of thrown away.