I definitely think this needs to be an open discussion between you and him about being transparent on all things in a relationship. At the end of it, if you feel like there was t transparency, maybe consider getting joint accounts. What I will also add for anyone who has one spouse paying bills and the other has no idea what is going on, is change that! My grandpa paid their bills for years and my grandma had her spending money. He died first and my grandma had no clue what was what. It took almost 5 years to get on a path. Please make sure this isn’t happening in your relationship, that is a hardship no one should have to go through in the grieving process. So, if it helps using that example to help him understand the importance, I recommend it.