Mental and emotional torture and threating of defaming

Me and my husband serve in different states I m working in a government sector and he is in mnc. we got married in November 2016.we had an affair of 8 years and somewhere I did not want to marry him because of his over possessive behavior but whenever I refused to marry he threatened me to defame me. anyway we got engaged by consent of family. but immediately some 2 or 3 month before engagement I got inclined towards some other boy and that boy insisted me to marry with him but I refused as I was engaged with my husband. then that boy send an objectionable (audio sex chat) audio to my husbands watsap. my husband got angry and shouted on me , I was afraid of breaking of our engagement so I apologized and asked my husband not to break that engagement. somewhere his love convinced him as he trusted me and we did not disclosed this matter in front of our family and finally we got married, but that incident printed a remark on my husbands mind, and now after marriage in his mothers influence he is asking me to leave my job and stay with him, when I refuse to leave job he tortures me by abusing over phone and asking for my savings and threating that he will present that past objectionable audio(phone sex) in front of my family and prove me characterless. his mothers behavior is also not good. they both play games with me. he has an sister (my sister in law)who lives apart from his husband and stays with my mother in-law.(me, my husband and my in-laws stays in different cities). although my sister in law lives apart from her husband but yet not divorced, she too create misunderstanding between me and my husband. and now frm past two weeks he blocked me over phone and watsap. I am unable to speak with him, when I complained my mother in law of that she said keep quite when my son will feel like calling he will call. I m stressed. I don't want to leave my job. I want to be happy with my husband, but sometimes I feel like taking divorce and live peacefully. because every now and then he threatens me of that audio incidence and uses bad words for me. if I file for divorce will that audio weaken my case??? what shoul I do?? how to deal with situation?? please help me. my parents don't knw these things. I m afraid that if I will tell this story to them. they will panic. please help.please.