As the old saying goes, "Loose lips sinks ships". It is a good idea to never reveal sites you discover on your own to anyone. Our hobby is highly competitive and to some, friendship or "fair play" means nothing. I introduced someone to the hobby once who turned out to be unethical. Never did it again. Like yourself, I learned that lesson the hard way. Some enjoys the company of others while detecting and to each his/her own but for me it will always be a solitary pursuit. Too bad that happened to you, but you can always find new sites but this time keep a tight lip! Good luck and HHing!