A line that really fascinates me is "life was never worse but never better," because it could mean that the relationship had both extremes of feelings - intense love and happiness as well as intense desperation and conflict - as in life had never been this bad before but it had also never been this good. But I feel like it could be her life being almost unaffected by the relationship; her life wasn't worse because of the person, but they didn't make her life any better either, so the initial passion just wasn't worth it in the end.
A line that really fascinates me is "life was never worse but never better," because it could mean that the relationship had both extremes of feelings - intense love and happiness as well as intense desperation and conflict - as in life had never been this bad before but it had also never been this good. But I feel like it could be her life being almost unaffected by the relationship; her life wasn't worse because of the person, but they didn't make her life any better either, so the initial passion just wasn't worth it in the end.