Years ago living together used to be like a kind of "trial marriage" - to see whether you were compatible or not before you actually tied the knot. Nowadays, it's done more for financial reasons.
I think it still is like that, but you can't afford a trial when there are children in the mix, you've got to be sure.
Get the "trial" in other ways.
Having such wildly different expectations about financial contributions is a red flag that you're probably not on the same page yet communications wise. Could go either way - you'll either never get there because you're both different or you will eventually but he's not invested in the relationship yet. Have some serious discussions about topics that can be emotional and see how that goes.
Spend time in each others' space without a long term commitment - e.g. a holiday. Like a self-catered holiday that's over a week. Several of these.
Spend time with each others' family.
Talk about these expectations like finances, but also childcare and housework and cooking/what food is going to be brought into the house, budgeting for things like food, entertainment, etc. Whether you want more children, whether either of you wants a pet, or to travel/move, to get married or not, retirement. I know this sounds crazy/long term but remember you only want to move someone in to live with your child(ren) ONCE (ideally).