Seek Divorce, Never Cohabited with Husband in 13 Years of marriage

I am married in July 2007, but never stayed with my husband till date. i was college student then and went to my parents’ home after registered marriage in bandra court as per Hindu marriage act. We both are Hindus. it was a love marriage, i did at the age of 20. My parents did not know about this. we did it secretly with his family and friends. Being youngest of the family, i had to wait till my post-graduation and my elder sister's marriage. Apparently 4 years passed. i had promised him to live with him after these 2 events but did not go. i have been requesting him for mutual consent divorce since last 8 years but he is refusing and has put a mandatory condition to stay with him for 6 months after that if he is convinced that i can’t stay with him, he will divorce me in mutual consent. My marriage is consummated but no relation since last 9 years. i don’t have any valid legal grounds to file case against him. Plese help with advice.