I always thought that having money meant having less problems. And for the most part, this is true. Because DH's business has been so successful the past few years, we haven't had to worry about bills and we've had some nice luxuries.

We split all of the household bills 50/50, put a set amount into joint savings and get to "keep" whatever we have left from our paychecks. Since his salary has grown to around 5x more than mine, this means that I have very little left over each month and he has a lot.

Lately we've had a few heated discussions about what to do with the extra money each month. It mostly revolves around how to save/invest it and how much should be spent on luxuries. Basically, he thinks that because he makes all of the extra income, he should be able to spend/save it however he wants. I think that since we're planning on starting a family soon, that he should start saving more of his salary in our joint account to cover future needs (college funds, bigger house, maternity leave...etc).

He sees this as punnishment for working hard and making more money. I am NOT interested in joining finances 100%. I like having my own money as well. But I feel like he's not stepping up to the plate when it comes to being a provider, and afraid for what might happen when we have a family to support.
Any advice would be appreciated!