Answer:
(Fatwa: 1256/1076=L/1429)
You can not marry her unless her husband gives her divorce or she gets khula. It is unlawful for you to meet or have any relation with her before Nikah, it will be considered adultery if you sleep with her. Both of you should do tauba (repentance) and seek forgiveness from Allah Almighty. Also, try to get her divorced or separated through khula. If it is not possible, get the matter solved through any nearby Islamic Panchayat or Darul Qaza. If the Islamic Panchayet or Darul Qaza cancels their nikah in the light of Islamic rulings, then you can marry her when her iddah will be over.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
