Maybe right now it is a control thing? One thing I've noticed over my many years of being married, divorced, and dating is that women always make statements such as "My BF/DH won't let me", etc., yet did you ever notice that men never consult women on their plans, purchases, etc.? Okay, maybe I shouldn't generalize but MOST men do as they wish when it comes to their own life, yet attempt to control, oversee or have a say in what their women do.
If you make your own money and aren't even married yet then he can go pound sand (IMO). As you said, it is his problem. But know that he is taking mental notes of your spending habits, and finances are one of the top reasons couples divorce. Once married, the fair thing to do if you are both working is contribute jointly to the household expenses and savings, and anything left over is your own disposable income to do as you wish.
Now if you were living soley off his income it is respectful to discuss major purchases, not assume that because you are taking care of the house and maybe his children someday that you are entitled to spend freely, even if he makes millions. Mutual respect goes a long way in a relationship.