Revealing too much information about someone is not appropriate.
Helen is talking with her sister, who is very distraught about a psychological issue.
Helen wants to make her sister feel better.
Helen tells her sister about something else who solved a similar issue and whose ordeal was public.
Helen tells her sister others are worse off than her and tells her about a more serious issue one of her friends told her about in confidence.
The person given as an example has gained another admirer.
The friend's psychological issue is now public knowledge.