When giving information in confidence you expect this to remain a private matter.
Prevention is better than cure, so if you are made aware of a potential breach, then you may wish to take Court action to obtain an injunction to prevent the disclosure of the confidential information to your detriment (or that of your business). If the breach has already occurred, an action for breach of confidence can be taken for compensation.

Examples of confidential information include personal employee records and medical records. However, it can also cover information that is personal such as details of relationships or private correspondence. The Court will apply what it calls ‘an intense focus’ on the facts of each individual case.

Breach Of Confidence Legal Advice Guide