Marriage and other long-term committed relationships are an integral part of our lives and confer many benefits. People in satisfying marriages report greater life happiness, live longer, and are less vulnerable to mental and physical illness. Unfortunately, many couples experience significant relationship distress and about half of marriages end in divorce. Among those who stay married, a notable number of couples remain in unstable, severely distressed marriages for years or even decades. Given the serious physical and psychological consequences of relationship distress and divorce for...