See where the money actually goes, get an honest read on whether this is overspending or a shortfall, and build a budget both of you would agree to — with a script for the conversation and a letter for the bills.
Which feels like a spending problem and often isn't. Housing above roughly a third of income explains more household budgets than any amount of discipline does, and almost nobody works out their own percentage.
Three subscriptions cancelled feels productive and barely moves the number. The lines that would move it — housing, transport, debt, insurance — are the ones nobody looks at, because looking at them is harder.
One person feels blamed, the other feels ignored, and the conversation ends without a decision. It's rarely about the numbers and usually about how the conversation was opened.
Usually because they were built from a good month with no slack in them. A plan that leaves no room fails on the first unexpected bill, and then it feels like your failure.