Easier said than done, I understand. But then again this really is the resolution to all conflicts.
In the 'he said she said' scenario, let's face it no one wins. Even if you make a point the other is left frustrated and the issue remains unresolved for the other. Instead of making points trying to prove your side, it's best that both simply refrain for making the personal opinions count and try to validate them.
Best is, to consult Quran and Sunnah. See what Allah swt has said about that matter, and then simply say. Let's agree upon the fact that neither of our points shall be followed. Whatsoever is said in the Quran and hadith let's follow that. Now that can fall in favor of either or parties. But the point is, both parties will have the peace of heart and mind that the followed the right path and that they resolved the issue to the best that it should've been.
May Allah swt guide us all, and may Allah swt make all our marriages last in this duniya and the here after. Ameen. !
