I don’t know how to do this....

My husband and I have had a rocky marriage he’s been in and out of jail and rehab our whole relationship. I have stuck by his side and supported him financially. I’ve done everything I can as a wife to be there for him in every way. He won’t change he’s still doing drugs and taking this extremely destructive path. I’m almost 40w pregnant with a baby girl and I’m not seeing any change in my husband. We are currently separated for obvious reasons, but we still talk. He’s very adamant about us living together again, but I just can’t. Something in my gut is telling me no. I don’t know how to break it to him though. I don’t want anyone’s opinion telling me to give him a chance. I’ve given him chances upon chances and nothing ever changes he’s into something even God can’t shake him out of. If I told you what I’ve seen and what I’ve lived through with him many wouldn’t even believe me. This little girl in my belly needs me I have to protect her I can’t keep running back to him.