We don't "fight" in that sense of the word. When we disagree about something, we just talk about it and figure out what to do. If there is a misunderstanding, or we disappoint the other person for some reason - again we talk about it and figure out what to do. For us actual fighting isn't really helpful - sometimes you say hurtful things in a fight you wish you could take back later, but you can't take those things back.
In a relationship, feelings are going to get hurt occasionally. It isn't the end of the world - especially when we remind each other we're sorry and certainly would never do it on purpose. Why fight over a mistake the other person is sorry for making?