Very similar situation with my partner and I, except we use budgeting software - I manage my own personal budget and our "joint" budget separately. My partner isn't interested in using the software for her own expenses, which is fine.
We can both see how much money is allocated to everything, if there's anything one of us wants to spend money on that would be a shared thing - we budget for it.
We can both see how much money is allocated to everything, if there's anything one of us wants to spend money on that would be a shared thing - we budget for it.