Husband involved in a relationship with another man

I am in great trouble and need sharia based solution. My husband is having sexual relationship with male guys and has been in this practice since puberty. I came to know when I got married to him. Another problem is that he wants me to be a part of his game and join his friends in this venture. I tried to get divorce but he says he will keep my children. I cannot leave my children with him cause he will destroy them. I am doing a job as he does not want to spend money on children's education. I have taken this responsibility but now as I want my children to join my school as it is a well known he is not allowing them and creating all the barrier to keep them not getting admission there. My only purpose in life is to provide quality future to my children so they may not become the victim for such a man and stand on their own feet.