Ask a Psychiatrist and Get Answers to Mental Health Questions ASAP
Sorry to hear of the situation. The specific rules regarding confidentiality vary across geographic regions but I can tell you that disclosing patient/client information to any third party without first obtaining the written consent of the patient/client or their guardian is highly unethical.
I'm not sure what kind of counselor this person is but if they happen to be a Psychologist registered with The British Psychological Society then they may have violated their registration guidelines. If they have and you make a formal complaint they will face disciplinary action. If you determine that this person is BPS registered then I suggest you lodge a formal complaint. You can find out everything you need to know about BPS ethical practice here: http://www.bps.org.uk/what-we-do/ethics-standards/ethics-standards
There is no way the disclosure you describe is ethical behavior on the part of the counselor.
I hope this answers your question. If you have further questions or would like me to elaborate further on anything I have written please let me know.