Legal Notice to come back-Domestic Abuse

I got married in the month of May2019 and soon after that the emotional and physical torture started . The first physical fight happened in the month of June and then the abuse continued bigger and bigger over the following months .I was constantly doubted by Alan .I was restricted from meeting my friends and even my family . He has mentally harassed me and tortured me to the extent that i was ready to take my life as the pain and humiliation was unbearable. .In this 6 months he has broken my phones and also has on numerous occasion threatened me that he will kill me and nobody would bat an eye. He has physically abused me and hit me in presence of his brother too.And everytime his parents were informed about the situation and they never intervened and asked me to adjust . I took my decision and left him as i feared the longer i stay the more it is gonna cause harm to me .At this point i was scared for my life .I came to my own house and i have been staying with my mother since . He has countlessly apologized for his behavior but my decision was final. I have received a legal notice from him today asking me to come back and he has put false allegations on me stating that i had extra marital affairs and he caught me in the act . Please tell me what are my legal options. How should i proceed as i want a divorce from him. At no cost am ready to go back and be in hell. I really need some guidance.