100% agree.
Yes, it is 'advisable' to spend on a credit card, rather than a debit card or use cash. Using a credit card means that you have more consumer protection, plus over the year (if the rest of your money is in accounts that get interest) you will get interest on one month's average spend. Even at a whopping 5% annual interest that's £75 interest per year. Not per month.
But whichever method you use to pay you need to understand every penny that you spend it on. The challenge with credit cards is that you completely lose that sense of where your money went. Even if you scrutinise your statement: £150 to Fatface, or cumulative amounts of £45 to McD's is easy to understand. But £170 to Tesco could be value tin of beans or tomatoes, it could be a school shirt, it could be £7.50 on a glossy home improvement magazine... You can't tell. And that can feel lke being out of control of your money.
I'm not suggesting you have to scrutinise everything forever, but for one month take a note book and pencil (or some way of doing it on your phone) and record eery single thing that you spend money on.
During covid and lockdown we went from 2 healthy salaries (some savings, an emergency fund, and no need to scrutinise our spending) to not enough to cover our usual bills. One or two months of listing every single thing was illuminating. Where we wasted money (a couple of subscriptions to things we didn't even use), where we could easily cut back (do you care what brand of bleach you put down your toilet?) etc. But it also helped me (and us) to understand things like the cost of razor blades, or the real price (and value) of nice cheese, or that top-up shops were costing about 30% of the main shop - so we needed to adjust or 'food bill' expectations by 30%.
We also got a new joint credit card that we both only use for petrol. That was illuminating. How much?? Plus parking! Now we are both more inclined to use public transport where we can.
I'm not suggesting that you live a life of parsimony. But it seems like neither you or your dp undestand how your money is being spent. More insight into that will most likely lessen his irritation, it should make you both feel more in control, and you may even be able to return to your ambition of saving money.
PS. Please, (unless you have done the above and have a genuine shared understanding of the total cost of your lifestyle, including some frivolitise and luxuries) never, never, let him take over the finances.