Just watch any husband arguing with his wife about something insignificant; listen to what they say and watch how their residual emotions manifest when the fight is over. It's so formulaic and unsurprising that you wouldn't dare re-create it in a movie. All the critics would mock it. They'd all say the screenwriter was a hack who didn't even try. This is why movies have less value than we like to pretend -- movies can't show reality, because honest depictions of reality offend intelligent people.