I checked when I wanted H to be responsible for his portion of our insurance, I could not drop him from my plan and have him get his own personal insurance. It was not an option in my state.
Is that because you're married still? That would make sense to me.
Yes, we're still married and in the same house and I hope we stay that way(but better!) but I couldn't and didn't want to keep carrying the financial responsibility for him. Plus, he/we had an accident and he had a speeding ticket so the rates increased.
A call to your agent would give you your options.
Live your life while you are still living. Riding the trail less traveled.