One of the reason finances are such a damaging issue amongst married couples is that it follows an assumption of guilt and responsibility. Being honest is a start, but in order to gain his trust - and more importantly, reaffirm your trust in him - you need to share the financial tasks. If only one person in the household is managing funds, there is always going to be an underlying sense of distrust. keep the books open. Removing the blinders prevents the opportunity to be dishonest, and allows him to see where problems exist, and help to fix them.