Marriage

Recently I got married 6 months back after marriage 3 days onwards he started avoiding me . me and my husband had a 4 days physical relationship before June and after that we are in same house but he is asking time to move physically and avoiding me completely. Recently I observed more changes in his behaviour and followed to office then I found them in Oyo room with help of police that he is having affair with married girl and she is pregnant . Now the stories comes into picture their are having 2 years relationship and my husband informed him before 4 days of our marriage that he is getting married and he married me . And girl also recently married with another guy she is pregnant now . With that pregnant women I found my husband in Oyo room . I have not filed any case but given petion In enquiry police gave me info like pregnancy is not related my husband and she married to another person and that is illegal affair I can't take any action on her . And when I check his mobile I found before our engagement and after our marriage also he went to Oyo room monthly once. My husband is not having interest with me he married bcoz of money and parents pressure. So can anyone suggest me what action I should take now .