Alot of times, young couples get over idulgence in fight. The whole purpose is to bring own's point of view to light. Be it in one's stand, one's feeling or one's contributions to a relationship. It does not determine any purpose for the eruption at last yet leave scars to a relationship in return. Fighting does not means breaking up thou. It just worsen and contributes to the mention of breaking up at times. People fight to earn attention and to gain sympathy points. Small fights helps to stimulate da chemistry that was once abandoned while big fights are somewhat fatal.
I respect Don fer her tolerance level in a relationship. That's something Im lacking of. To swallow one's pride and to put up with such treatment is a hard case to crack, but she did it all well.