Immature and irresponsible husband

I have been married for 1 year. However, at the starting of my marriage, I was living in other city because of my job. As per my in laws ask, i left my job and came to live along with them. However, i came to know that my husband was not working at all. My in laws went for a marriage for 5 days. My husband started living in another room without any problem. I fell ill and my in laws used to take me to doctor. He never bought a single medicine for me. He started humiliating me in front of anyone. When I tried to make him understand, he started telling everything to his parents. He used to tell even the bedroom talks. Finally I decided to move away from his parents along with him just to make him more responsible. However, he started domestic violence. I fell ill and still no emotion was shown. I encouraged myself and went to my parents for medical treatment and then after living there for 3 weeks, i decided to move out of the relationship. As when i living in my parents' home, nobody showed up to check upon me. Now, when i moved to a pg, my husband started coming to my office and created a scene. His parents agreed upon the mutual divorce. However, just before the day of divorce, they postponed the plan and never called me back for the divorce. Two days back, my husband called me up and said that if i wanted a divorce, i had to pay him the money spent by his parents on our wedding. What should I do? He has never shown a single sign of responsibility. I used to go for medical checkups on my own. I loved his family. But all i have got his mental torture. Even I am not asking for any money from them. Because of them, I had to leave my job, my career everything.