Wife isn't ready for divorce to attain pr dependency

Pease help me! It had been 4 years since marriage. But, we never had any compatibility and there are rigourours fights. I have a four year old son suffering with ASD. I wish to take divorce from her because she doesn't take care of the kid at all, insults me and my family, there is sheerly no love and respect. the child happended as her parents forced me because she had endomitrosis, about which we were never told before marriage. Initially she agreed for divorce but then later her aspirations to live in UK led her to change her mind. she wants to practice her dentistry in UK and can live here only as my dependent. so she denies of divorce. it is very difficult to live withhut peace as I have moed into Permannet residence. Her dependency in previous visa has dissolved and now she can get ILR only after 5 years. she keeps threatening e of going to cops for small quarrels. I am bound by UK laws beacuse a record into PNC even for enquiry affects job interviews etc. she has already charged me of domestic violence but I was discharged of defence against attack. I hail from Coimbatore. Living in UK for past 10 years.