This is the third part in the two-part episode(s) that opened this season. The relative trustworthiness model and the 8 laws of trust apply to every relationship, and in this episode, completely disconnected from the 10 causes for divorce cited in the previous two episodes, the model will be applied to why some marriages last, and some end up in divorce. It all has to do with risk, fear, trust, safety, and danger. The episode concludes with some advice for couples considering getting married on how to assure the beginning of a happy and sustainable marriage.