We are born into this world being concerned about only one person–ourselves! Then we grow. We develop. We mature. We get involved in a relationship with someone else. The quickest way for that relationship to end is to stay concerned about only one person–ourselves! For a relationship to be strong and remain healthy, both parties in that relationship must learn to be concerned about the other…and be more concerned about the other than self! 
In your relationships, “…Let each esteem others better than himself. Let each of you look out not only for his own interests, but also for the interests of others” (Phil. 2:3-4). “In honor giving preference to one another” (Rom. 12:10). “Just as you want [him or her] to do to you, you also do to [him or her] likewise” (Luke 6:31).
Do something for (or with) the other that is not really “your thing” but is “their thing.” Go out of your way to “do for” the other, even when it’s not convenient or desired. Make the relationship about the other and not about you. Serve. Help. Give. Love. Do.