Your own money

Me and my so are just bf and gf he gets upset when i ask him about his money but i feel weve been together for a while almost 2 years we share a car note, insurance and getting a place so i feel like i don't have to be wife to know. I always keep my own money though because my grandma taught me you never know when your man might lose his job, or leave you or deny you of something you need so always keep your own little secret stash. Anybody else do this?