My son sperm donor has decided not to be apart of my life anymore because I will not allow my son to…

My son sperm donor has decided not to be apart of my life anymore because I will not allow my son to live with him. He hasn't been in life for 7 1/2 years and he is 9. He has been in and out prison for the last 7 1/2 years. I moved to Vegas 5 years ago so he could be in my son's life and he went prison twice. I just don't understand him.