be faithful to one's words

But the link between fidelity and intelligence does not apply to women, because they have always been expected to be faithful to one mate.

但是，女性对伴侣忠诚与否与智商没有关系，因为在进化的任何阶段，女性都只对一个伴侣忠诚。

Understanding that the foundation for remaining faithful is not be based on a fear of hurting her, it's based on the absolute fact that I want to be faithful because she is the one I want to be with.

知道保持忠诚的基础不是建立在担心伤害她的基础上，而是建立在我想忠诚的事实上，因为她是我唯一想呆在一起的人。

There is only one truth, to be faithful to life, and to love it.

世上只有一个真理，便是忠实于人生，并且爱它。