Divorce and protection of my parents

I was in a long-distance relationship, got married 4 years ago, my husband was unemployed at that time, which he is still. I trusted him, and believed he would do something in his life. gradually after marrying I came to know he lies to me, steals my money, my jewellery, smokes and is an addict. Initially I hid these things from my parents, thinking that he would change, but nothing has changed. I want to get divorce, but my husband is not ready and know he has started threatening me that he would commit suicide and put blame on me and my parents for abetment of suicide. I have told my mother-in law, she never refuses for divorce, but doesn’t supports me either. When ever I speak to her regarding divorce she starts speaking about society and that her son will change ones he get a job which is like a never happening thing. My husband dreams of a high paying job, would not settle for anything less, so basically he won’t work. Asking for divorce is like starting world war 3 at home, which has actually happened several times and it’s such a shame in apartment after that. I know just to show me, he pretends of committing suicide, would take knife from kitchen or all drugs from cupboard or pretend of hanging/throttling. But I fear if something happens mistakenly. what should I do?? I have even consulted a psychiatrist for his addiction, but even that is not helping.