Will the kaanoon supports me

Me and my relative was in love, due to some reasons he got married to another woman who said she can divorce him if he didn't get interest on her after marriage so he believed her and got married, after marriage he tried to be good but he couldn't, by seeing this his wife told him that he is not happy with her, he is still liking his niece so give divorce and he happy with his niece.. and also she has requested his niece to spend sometime with her husband, if his niece is ready to come into his life then he can divorce him and allow him to be with his niece as she just want to see his happiness... So his niece belived her completely and started spending time with him , her feelings were grown completely and his feelings also believing his wife, we both are committed now.. Now his wife is telling she is not ready to give divorce to him. As she is the main culprit what can I do now.. because of this her husband lost his job and he got adicted to bad habits and almost she spoiled his life (who once said she is much concern about his happiness) his health condition is in worst stage.