Changing your mind or “updating” is not necessarily a sign of rationality. You could also update for wrong reasons.
For example, a divorce can happen when a person has unrealistic expectations on marriage. Updating their beliefs about their partner would be just a side effect of refusing to update their beliefs about marriage.
Also, in some cases, the divorce could have been planned since the beginning (for example for financial gain), so it actually did not include a change of mind.
Changing your mind or “updating” is not necessarily a sign of rationality. You could also update for wrong reasons.
For example, a divorce can happen when a person has unrealistic expectations on marriage. Updating their beliefs about their partner would be just a side effect of refusing to update their beliefs about marriage.
Also, in some cases, the divorce could have been planned since the beginning (for example for financial gain), so it actually did not include a change of mind.