If you guys stay longer together, you will have much more of this, and you better settle this now, otherwise you will face much steeper issues down the road. Who pays for the next car? Who pays for kids' schooling?
You have a much better chance of solving this specific issue by solving the issue of balance at large, instead of trying to solve them one by one and creating a tit-for-tat or revenge/regret situation.
There are 2 opposing options to go on with this with a lot of grey zones in the middle.
On the one side, you have a factual separation of goods (i.e. financials) and an assumed/felt balance of work/duties which is always very subjective, since it's hard to compare different duties managing a household as 1:1 as you can compare expenses. This case is a very technical one, where you reduce the need for discussions to the maximum and also prepare yourself for an eventual separation at the same time since you basically attach ownership to everything in the household, e.g. if the car is owned 50/50 since you decided that when you bought it. In order to go down that route however, you will have to get ready on both sides to get rid of all many potential cultural notions, be it who changes the diapers of the baby or who's paying for dinner. It therefore requires that you both agree that you do not want to take the other's cultural values into account at the price of giving up your own. This can be tricky however since there might be an eternal grudge coming up every time someone needs to do or pay for something they consider the other's duty. And you might have situations where you split costs or duties in a way where BOTH your cultural values being violated just to create equity.
On the other side, you have a completely subjective balance, based on cultural values and shared emotions on how the other's cultural values are being understood. This is easy where both of your cultural values align (e.g. both of you think that it's her job to cook), but the more points you agree on, the harder it gets to accept that some parts are different and have strong cultural values in the other person's brain. The risk (and what happened with you apparently) is that a difference in cultural values comes as a surprise and is perceived as one person trying to take advantage of the other.
This requires a lot of sensible communication where everyone, before making a request on who pays for what or who does what, acknowledge first that this discussion is NOT about taking advantage but actual cultural value differences. Once you both understand that the intention is actually to have a balanced relationship AND respect for BOTH of your cultural values, you have a chance to prepare for instances where either the impact is large because the expenses or workload is high (pay rent, buy a car, cook everyday) or where the cultural value is surprisingly high (e.g. "I would never talk to a repair man, that's your job") despite it seeming like a small issue by the other side.
In this case, you need to first have a conversation with your partner that those differences in cultural values actually exist and maybe have a conversation that lists "typical" female/male roles and how you both see those. If she does not expects to pay for the apartment, maybe she plans to also never work again once you are married or that both of your income goes anyhow into a shared account. You better want to know that now and be prepared to give up some of your expectations if you expect her to do that as well.
