Insurance

I'm buying a new car and paying all up front. I want full coverage since it's a 2016 and I'm paying 24,000$. My fiancé seems to think that I shouldn get liability our other car is just liability but we bought it for 800$. I want full coverage for my car. We had an argument about it he seems to think I shouldn't worry because I'm a good driver but accidents happen.
How could I approach this situation to help him understand where I'm ,coming  from? I've already tried giving him examples.