If you stay in your own home, and give yourself time, you have no more to lose.
If he is sincere, and works hard on his own recovery, then he will understand and support your decision.
If he is not sincere, you will thank God that you did not move in to his home with your son.
Stay here at SR, and look into Al Anon, Help yourself to heal. Best present you will ever give to yourself and your child.