I think a relationship is just what it sounds like - a relationship, if you relate to one another through measurement or comparison (he/she has this, I have that) it's always going to be looking at the "me" part of the relationship, an endless cycle of want and attempts at things to be "fairer" - the cause of a huge amount of arguments.
I think it's good to try being in the other part of the relationship, which is somewhat spontaneous, and more about dissolving some of the divide between you and your partner, what is good for them is good for you and vice versa, doesn't mean being a doormat of course, it just means that any illusion of 'compromise' or comparison is really going the wrong direction. In my own experience, the more accepting I have been of my partner, the more accepting they are of me and some of the tension of "who should get what" begins to resolve.
In practical terms it just means worrying less about fairness from your own point, and more about the well being of your partner, family member or whatever...big surprise.
"Just as a lotus does not grow out of a well-levelled soil but from the mire, in the same way the awakening mind
is not born in the hearts of disciples in whom the moisture of attachment has dried up. It grows instead in the hearts of ordinary sentient beings who possess in full the fetters of bondage." -Se Chilbu Choki Gyaltsen