@Grathe,
Yeah, here's a suggestion. Move out. When he divorces his wife, then consider a relationship with him.
Also, bear in mind that if you continue to stay with him, he will always have ties to his other family. He has a daughter there and he will retain that relationship. He will need to try to be on good terms with his wife. You need to accept that and be able to deal with it or your relationship is doomed from the start.