I think it's about running into your ex who f'ed you over and being still crazy about her, then she tells you how great things are going for her but it's obvious that she's lying and she's miserable and her life is really f'ed up. She starts being nice because she knows she screwed up with you but you realize that you're over her; still you feel bad that her life is so awful and that however she f'ed you over is dragging her down (bad crowd, drugs, cheating, whatever.)
I think it's about running into your ex who f'ed you over and being still crazy about her, then she tells you how great things are going for her but it's obvious that she's lying and she's miserable and her life is really f'ed up. She starts being nice because she knows she screwed up with you but you realize that you're over her; still you feel bad that her life is so awful and that however she f'ed you over is dragging her down (bad crowd, drugs, cheating, whatever.)