Welcome back. Get out while you can. You cannot live a lie for your mom and dad. You will be a bitter old, childless, unhappy woman. Where will you be in 5 years if you stay in.
I am so sorry dear, you have to be strong. Start making arrangements.
The only hope is if you could find your husbands weak spot regarding the truth, or your parents. Since you will have to deal with this anyway, give it a shot once you are in a position of power and independence. Do not have a child with this man. Your child deserves to be brought into a home with two parents who love one another.
Be well, dear, our thoughts are with you. Keep us posted.