@Qtpatootie,
Since you seem to be pretty intent on arguing against the advice being given....
Give this guy the money, it'll be fine. Don't worry about the marriage thing, eight years is just a tiny fraction of time. You are 26, you've got at least a good 50 years to keep waiting, you'll change him sooner or later.
The yelling and slamming and demanding sex while you are recovering from surgery? All that is totally normal, happens to us all. And those four young kids, don't worry at all about their safety or stability, you guys are excellent role models. In another 16 years or so they'll be grown up and acting just like mom and dad, so another bonus for society.
Best of luck!