It was so awful telling my husband he couldn't drive anymore. He didn't react when he nearly killed us and the other driver. It turned into a screaming/crying argument, one-sided since he shows little emotion anymore. He didn't want to give up the car keys, or his driving privilege, but I told him his brain was not giving him correct information anymore, which puts us and others in danger. I did manage to get him to voluntarily give up his driver's license at the DMV.
It was all just traumatizing for me.
Hope it goes better for you!