Living together - what's the money situation?

I've been living with my bf for a year and we never tell each other how much money we have in our banks. We obviously still have separate bank accounts. I'm just curious do you and your SO share a bank account? Is it only right to do once you get married? Do you tell each other how much you have in your personal bank? Or do you keep it on the DL because money shouldn't matter to them?