As per your query it seems that you desperately need divorce and your husband doesn't want even at 100% discount rate offered by you.
So,following are my opinions:
1. File for divorce on the basis of mental cruelity and desertion.
2. During first 3 years what mental cruelities done to you just write and choose the most pathetic ones.
3. Also choose the enormous cruelity done by him after 3 years that had made you adamant not to join him.
4. Hire an extreme smart lawyer who could argue your case on the basis of the above facts and Convince the judge that it's highly impossible to cohabit with the respondent as desertion been crossed the acute level where petitioner caan't rebuilt her mind by forgeting all the mental cruelities.
5. It's better that you are earning and lot's of time on maintenance cases and Dv cases and 498a cases will be saved,Just concentrate on you Divorce case only under sec-13 HMA.
6.Rest your God,Lawyer and Judge will do.
regards.