Cheating husband

We are married for 4years and this is my second marriage. My first husband passed away due to drinking habits. When we fix this match via matrimony website we clearly explained our past and mentioned them we are looking for a good groom. They confirmed that they don’t have any bad habits. Post marriage I found that he regularly eats pan, then he smokes and drinks too. Due to my aged parents I adjusted and lived with him. Once I took him to my friends house where he took picture of her without al our knowledge. I found this after a week without him knowing this. Then I checked his mobile completely and found lot of my friends pic being edited and saved which I have kept it as my WhatsApp dp. I didn’t confront him as am scared of my future and thinking about my aged parents. Also I came to know that he is addicted to porn sites. Now he is doing sex chats, downloading girls nude pictures and also having contact with those girls and asking more nude pictures. Even I saw all these in his phone without his knowledge as he always carries his phone as his heart. He keep secret passwords. I really don’t know how to tackle this