Except when you get married it's both of your shit. That's the whole agreement. It's shared shit. Don't like it don't enter the legal agreement, or get a prenump. Thinking you get to leave the marriage with more than half the martial assets because it's somehow yours is just some boomer sexist crap.
In the eyes of the state, you are entering into a 50/50 business partnership. All assets become shared by the new legal entity. That's what marriage does. If you don't like this, don't get married. Doesn't matter if one of you is more successful or contributes more, you are adding to the value of the shared entity.
That’s not quite right. Preexisting assets kept separately don’t just become marital assets. If you owned a home prior to the marriage and you then live there together, it almost certainly would be considered a marital property.
But certainly every dollar you make or asset you acquire while married counts.