Marriage fraud and legal status of marriage

My boyfriend's parents were not ready to consent to our marriage and got him married to somebody else by threatening suicide. My told me about this but said forced marriages are not legal and married me afterwards without telling his parents but didn't agree to register our marriage fearing his parents will come to know, who are not his real parents( his parents died in accident when he was infant and he has been raised by his tau and taai). It's been five years, he never took me along. I have been living with my parents since marriage. He kept on giving excuses about financial problems etc. Now he told me has a daughter with his first wife and he can't leave his daughter but also don't want to stop talking and meeting me. He is threatening me with suicide if I don't forgive him. I don't want to fight any legal battle as I will loose mental peace and my life will be spent in court only. Also his parents are powerful people. What should I do and what is legal status of marriage?