My husband did a second marriage

I was married to my husband 9 yrs back.I have four children one son and 3 daughters. Fed up of his abusive nature and addiction of weed and his carelessness about earning money,1.5 yrs ago I left his place giving him a warning that I will come back only when he stop domestic violence and verbal abuse and his addiction. I took admission here and I was studing. He didn't let me take my children the elder 3 are with him and my in-laws. 3 months back I went to visit him and children and there he told me he has done a second marriage. What do I do now... I thought of going back to him permanently after completing my studies and having a job but now I can't live with him. I am a Muslim and he is welcoming me and has promised to give me a separate accomodation with my children but my ego and self respect is not allowing me to go back to him and live in that trio kinda situ. But on the other hand I also don't wanna loose my children. Another problem is that my children will not leave there home and grandparent and dad. What shud I do. I thought that he wud work on himself by the time I will visit him once or twice a yr and wen I ll be independent he will think twice b4 beating me again. But evrything went out of place. I am shattered. My age is 31 now. At the age of 21 I was married to him by my father