Couple fights

Why the couples fight?? Why is possible feel the biggest angry for someone that is so important in our life??
In my opinion, I don't think the fights just exist to destroy the relationship. I think if the couple use the speech to continues building the intimity and depending of the case, changing the behavior to can live together, in this case, I think it can be a good oportunity for the couple. Sure, the best should don't fight and listen the complaints with calm, but is difficult react ok if someone is saying to you that you are doing something wrong...but, maybe one day we can arrive, no?!
by Lia