Couples Who Fight Have Stronger Relationships

Are couples who fight actually stronger than those who passively aggressively go through the motions? Do we fight because we care?

Mike and Gigi got into a fight...only it wasn't the same fight. Gigi thought they were fighting about one thing, Mike an entirely different set of things. Little by little, anger blew up out of tiny circumstances. 

Love is confusing. So, how do you get to the bottom of what is going inside another person's head?