For YOUR sake, I'd tell him to get lost and not to come near the delivery room! Unfortunately, for the sake of that innocent little baby you're having, it's better that he be present for the delivery - important for him to have that bonding experience with the baby, it may make him just a smidgen more responsible for him/her in the future.
I do hope you have someone else to be your labor coach though? I sure wouldn't want to be counting on him in that pinch. Best to have a friend or family member with you.
