where else are my videos being played on the internet?

OK, so i've got a bit of a problem with a hater.  I write YouTube videos and was doing quite well until one of my haters started posting my videos into his group which is against my views.  We had a heated argument and I told him I didnt want my videos in his group.  My content and my videos make his group.  They're the foundation of his group.  So, his way of winning the argument is to open a private group where thousands and thousands are members, he waits til I upload, then he downloads my videos and puts them in his private secret group.  I lose all revenue.  My viewing figures have dropped rapidly from 20k to 1k because everyone goes to his secret group.  

The thing is I dont know where his secret group is.  He told me that's what he's doing and stuck it in my face by saying 'good luck with your views'.  

Is there any way of finding where else my videos are being played on the internet??  Is there a site that can search for certain videos and tell me all the places they're being played?