I agree 50/50 is a useless tip too. But 100/100 is NOT the solution. It is not related to the problem.
Yes, the 100/100 is (a) still keeping score when you’re on the same team and (b) ignores that there is an ebb and flow to our capacity to do what we can do and want to do, let alone what we ought to do.
It is better to say that you give as much of your all as you have to give. When you can’t, you say, “Lord, you love her,/him because right this minute I can’t do it.” (That is a remarkably effective prayer, if you haven’t tried it.)
My advice to married couples, for instance, is this: Always apologize when you’re wrong, but especially when you aren’t the most wrong.
Why? (a) the person who is the most wrong is very often the most defensive and has the most difficult time coming out and being vulnerable by saying they’re wrong. They know their spouse has it on them, and it is hard to go there. If your spouse who did less wrong apologizes, though, it is far easier to be generous and say, “oh, no it should be me apologizing to you.”
(b) let’s face it, most disputes wouldn’t be disputes if we didn’t think the other party is the most wrong.
Also, apologizing means you’re saying you’re sorry without expectation of a counter-apology. You’re sticking with what you did wrong. You have to go in realizing that the other party may not even see that they did anything wrong…maybe yet, maybe not ever.