Linda Reeves recently referenced a talk given by Spencer Kimball when I was a child.

So I looked it up that old conference talk.  And below is the section she referenced.

This is good for me to remember in my life full of favorite activities and causes and responsibilities that I enjoy and that call for my attention.

"'Thou shalt love thy wife with all thy heart, and shall cleave unto her and none else' (D&C 42:22)

"And, when the Lord says all thy heart, it allows for no sharing nor dividing nor depriving. And, to the woman it [could be] paraphrased: 'Thou shalt love thy husband with all thy heart and shall cleave unto him and none else.' 

"The words none else eliminate everyone and everything. The spouse then becomes preeminent in the life of the husband or wife, and neither social life nor occupational life nor political life nor any other interest nor person nor thing shall ever take precedence over the companion spouse. ...

"Marriage presupposes total allegiance and total fidelity. Each spouse takes the partner with the understanding that he or she gives self totally to the spouse: all the heart, strength, loyalty, honor, and affection with all dignity. Any divergence is sin—any sharing the heart is transgression. As we should have "an eye single to the glory of God" (D&C 4:5; D&C 82:19) so should we have an eye, an ear, a heart single to the marriage and the spouse and family."

From his talk, "Spouses and None Else", which you can read HERE

My mom and dad, who live this.