Case against of husband

I got second marriage to someone. at the time of marriage he told to me he got divorce from his first wife. but after marriage his father told to me, he escaped from his first wife before six months of my marriage and now he trying to escape from me also. i put a case against him in a police station, in that police station, he agreed to take divorce from his first wife and dont go away from me. but he is not stand on his words. he trying to go away from me again and again. after some days he scold me and beaten me very badly. after some days i went his house with my mother presence and staying along with child (she is having 9yrs and she is from my ex husbands). now he is put case with a lowyer that is mutural divorce from me. i agreed for that. but i dont know what happend, suddenly he changed his mind and he asking me to stay with him. then my brother told some conditions to him. he is ok for that. but my question is: can i ask him his first wifes divorce papaers? if he is not accept to take divorce from his first wife, is there any chance his first wife to come back and put a case against him and me? what are my risk factors in this case? please suggest anyone.....