Witten Divorce or Mutual Talaq

As-Salam Alaikum, my wife has been cheating me since 6 years, after i was able to hack her whatsapps account i came to know about it, when i asked her, she accepted about her affair and told me she would stop but will remain in contact by phone calls twice a day. I agreed to save my marriage as we have two kids. these phone calls continued for long( (almost 2 years), every time i told her to stop all these she says she wants to take revenge (insisting that she wants to break his marriage, as he cheated her and married to other women). at present, though she has stopped talking she is encouraging me to get married as she cannot accept me as husband and she has no intimate feeling for me but on condition to get written divorce from me. when i was not aware about her affair somehow she was able to get one property on her name (by gift deed) and another property as co-owner (this property is on loan and i am paying EMI approx. 60k) . please advise me how to handle this situation legally?