Sounds to me like he wants family life but a single person's budget? His kids? His cash.
We earn similar amounts but put all money in one pot which pays for mortgage, bills, groceries, petrol on both cars, meals out between us two, anything for the kids etc.
We have a set amount left over for personal spending each month which is the same. This is for things like solo hobbies, our own clothes, beauty stuff for me etc, anything we want to buy for ourselves.
At points in our lives we have both earned significantly less than eachother, when I was on maternity he paid for everything but when I was full time I earned like £1500 more than him a month. So we figured what goes around comes around.
Don't understand people who are married with kids who think all their money is theirs, huge red flag.
Another way you can do it, is doing percentages of total income. You earn £1500 he earns 3k. Total income 4500. You earn 30% of total I come he 70% therefore that's your contributions for all family's costs, personal spending money leftover.