Usually people quarrel over nonsense, trivial matters that need not be paid attention to.
It is difficult to imagine a truly fundamental reason for the quarrel, which would be a weighty reason for parting. Usually there are very few such reasons; they can be counted on the fingers of one hand.
Scandals are always very small, insignificant. Claims that are expressed to each other during scandals are also negligible on a global scale of these relations.
To say something serious is very difficult. At such moments, the right words have somehow not been invented yet.
What is important for real? This is your inner feeling. When your relationship is consistently beginning to be associated with a fetid swamp, then the next evening quarrel becomes not a problem, but a release and a way out of a difficult situation.