Traditional marriage vows express the nature of this choice beautifully. The two people standing at the altar do not say, “You will. You will love me and cherish me in sickness and in health, till death do us part.” And they don’t say, “I will love you as long as you love me. I will be faithful to you as long as you are faithful to me.” Their vows are all about what they are going to do. “I will love you. I will protect you. I will serve you. I will be faithful to you, no matter what.
Danny Silk in his book Keep Your Love On.