It's rude to keep secrets from your significant other.
John and MIndy are married but John has racked up a ton of debt due to his private gambling problem.
John wants to keep his marriage to Mindy.
John confides his problem to Mindy and says he'll stop and goes to AA meetings.
John keeps his gambling problem a secret from Mindy until all their money is gone.
Mindy respects and supports John as he gets better and their marriage strengthens.
Mindy eventually finds out the truth and is angry and leaves John.