@delitefulmane
Your question is requires a question. Do you spend a lot of money just because? I ask because in my marriage, I don't routinely spend a lot so when I make a purchase, no matter the price, it just is. However, because I have a conscious, when its over a certain amount, I'll say something about it before I hit purchase. Sometimes I find out that he wanted to get something for himself or the kids or that he has a household item he wants to upgrade so I won't do it.
However, if you are newly married and used to doing your own thing, you might want to say something before you spend just as a courtesy. You may find that he will start doing the same and then the two of you can head off those extra shoe purchases or those spur of the moment tech gadget purchases the other might be prone to making.
You have to find your personal balance, especially if he pays most of the bills and/or makes more money than you. You don't want to feel beholden to his generosity, even though you contribute to the finances as well. I had a girlfriend who used to hide her purchases in her trunk and make her husband believe she already had them in the back of her junky closet.