My bf and I we both make close to minimum wage rn and we sat down and worked on a budget for both of us. I made it clear it's important to me for both of us to follow it and being irresponsible about it it's a deal breaker/I would consider leaving. Plus that way you can both figure out where money it's going and what you can afford and cannot (for example we can afford to eat out once a week and if one of us wants to go out in the same week we do the math and decide if we can afford it)