Marital problems

I have a question regarding divorce. Me and my wife have had a lot of problems. And we end up living separated. But I said once that I give her divorce. But we lived together after that. Then we got problems. I didn't have problems with her. But her family had a lot of problems with me. And I shifted from my wife. I live in Norway. And my wife applied separation in Norwegian law. But I didn't give her divorce. But her parents got some kind of fatwa from somebody in Pakistan that it's a valid divorce. My question is, is it a valid divorce? How is that possible? She wants to comeback as she told me two months ago.