Telling the Money Maker NO

HHow do you do money management when the stay-at-home person manages the very tight budget and the person working to pay for everything just wants to SPEND? I feel guilty telling him no because he worked for it but really, you can't spend like you have unlimited funds. He says it is "our" money but I still feel guilty when he wants something (he wants a lot of somethings often) and I tell him no. Oy.