Tip - The marriage was never really very good

The marriage was never really very good, and they wait to divorce until after the children are older.
One person is having an affair—and is discovered. About 25-33% of marriages cannot recover from affairs.
One person falls in love with another person.
One spouse can no longer tolerate the abuse—verbal, physical or sexual. Abuse is still one of the highest reasons people divorce. Often, one spouse tolerates the abuse for a relatively long time. What makes that person say “enough” is:  (a) maturity; the person is in therapy and the help kicks in; (b) one or more of the children are “little adults” who speak up; and (c) the legal system has finally listened or responded—there are charges, trials and/or prison sentences.