The document discusses personality traits that contribute to relationship happiness and unhappiness, finding that issues like moodiness, negativity, control, withdrawal, stubbornness, and temper are much more common among unhappy couples compared to happy couples. It provides tips for dealing with personality issues like focusing on positive traits, taking responsibility for one's own behavior, and communicating to enhance the relationship with one's partner's personality strengths. Graphs and tables in the document compare rates of different personality problems between happy and unhappy couples.