片子一开始，在夜行的火车上，女主角摄影师克莱丽的母亲告诉她：“我不爱你的父亲，但生下你以后我们很快乐。”这话似乎暗示克莱丽也要在爱和快乐中选择。
年轻又多才多艺的克莱丽一直找不到让她去爱的人，直到她在街上拍照时碰到为人正直又有涵养的儿童图书编辑克利夫。克利夫被她的美丽和气质深深吸引，一见钟情，她也被克利夫打动芳心，二人决定结婚。然而结婚前夕，克莱丽又遇见了像一团烈焰能把她吞噬的“狗仔队”摄影师莫内。拥有共同兴趣的他们分享着对摄影的狂热，最后发展出一段热情如火的爱恋，但为了守信，为了一份忠贞，克莱丽坚持跟克利夫在一起，纵使内心受到巨大冲击。
三十五岁的克利夫为人正直又具文学气息，品行端正，家世良好，莫内则粗野、暴力、生活动荡。克莱丽的内心挣扎不是为了要选择谁，她爱丈夫，不会离开他，她只是努力把持自己不坠入莫内的诱惑。在莫内的居室外，她说：“我无法抗拒你。”所以她选择离开。爱已令她倍受折磨。若加上身体的关系，背叛就更深了一层。克莱丽并不是个拘谨或对宗教特别虔诚的人，但她会遵守对一个人许下的婚姻诺言，就算她知道信守这个承诺是相当困难，因为这是她追求自由的方法。
忠贞也不尽是身体的忠贞，克莱丽爱上莫内后，感情的越轨和矛盾令她痛苦和无助。母亲和旧情人马克华——克莱丽的上司——的纠葛也让她痛苦。马克华对母亲的背叛，牧师对上帝的背叛，非洲公主对世俗的背叛，倒卖人体器官者对人性的背叛……背叛充斥本片，就象克莱丽的题为“再也没有了忠诚，没什么可以失去”的摄影作品。而多次出现在片中的婚戒似乎昭示着仍有神圣高于一切的盟誓，也许忠贞一词被选做片名正是为此。
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