The only way you get to have his hands OFF you, is if you go totally no contact other than that legally needed about your kids. If you want this harassment and sexual abuse to stop, you need to get legal advice and do what it takes toget thru his thick skull, that you are NOT together and you are not his "property".
Not only is this a horrid experience for you, but what a disgusting example to have set before your children. They do not need to see their father's unacceptable behavior to their mother, or assume it is ok by you, because nothing is done about it.
Honestly my dear, the sooner you take steps to keep him physically away from you, and limit contact to the absolute necessities only, the better and safer you will feel.
God bless