Keeps The Fights Alive:
Fights are good, even healthy, but not if they never end. It is completely okay to voice your opinions in front of your partner even if they oppose his own and it is okay to have a discussion from two different points of views.
However if he never agrees to settle on a decision and is not willing to let you keep your opinion, he is the problem. Both the people involved have to respect each other differences. If he likes to the opposite and keeps the fights alive, you need to move away.