Looking for advice on physical exploitation

Dear Sir, Dear sir I am residing in Haryana and working in Delhi, I got in touch with a man in 2014 (Through common female friend) who come accross me for my help to get her mother to be admited in a hospital in Delhi, and i helped him. later we all three used to meet out in shopping mall and other public places and exchange phone call, chat etc till 2014 end untill my husband know the incident and my husband had a hot conversation with him and our female friend over phone and for instance we stop. later my female friend break her contact with me but that person again start calling me and again we follow the same schedule . we usually met always at public places like shopping mall of Delhi, Noida, Akshardham temple etc but, in mid of august 2018 he planned to meet at hotel in Vaishali, Gaziabad (UP) and he convinced me that he has no such wrong intentions only he would like to cut cake and celebrate his belated birthday (Stating that my wife spoiled my birthday so i wanted to celebrate the same with you) which already passed in July. On said day i approached to a metro station, he picked me from his car and later we drove to hotel where there were no such birthday like arrangement and he demanding for sexual favours from me at the instance i straightaway refused to do so but he convinced me to have sexual intercourse, after he also trying some unnatural sex which i strongly refused and he stopped this. When we about to checkout from hotel he said “ Dekh ye hai sahi badla tere husband ke liye”. I already in state of shock and guilt and his this wordings broke my soul and mind and i then realised that i have done wrong and he has done this just to take revenge from my husband. After the above i incident I limited my phone call to him and one day my husband downloaded my Jio phone call details through app and findout out call details last shown 27th August., which worked as spark in my family life, all my relatives, my in laws all got to know about my affair (Except our physical relation) as result of above my husband became out of his sense and start quarrel for initial stage and asking for more details like places we usually meet and at last i broke down and tell each and everything to him but, at my upmost surprise he given me his sympathy and showing is affection but he himself gone into depression, lost his sense, broke up internally, stopped paying attention to his work but, still didn’t disclosed anybody. I know, i was wrong but, I am not only who is responsible for this mental trauma faced by Me, my husband, family and our daughter therefore, with the support of my husband i finally decide to take legal action against him, but in this high time we couldn’t consult any legal person or police and not even to police until we both not sure that what kind of offence is this therefore you are kindly requested to give me best advice.