I agree with trippedoutgirl, is there a reason why they divorced? maybe he didnt want out of the marriage and she did...he needs to decide one way of the other, it is not fair to you or her. take care, I will you the best.
Only he can do this for himself, He has to want to cut away from her. Many people leave each other and become best of friends. They just cant live together while married. He needs to make up his mind to who he really want s to live with and move on. Good luck and GOD bless.