The best way to avoid any conflict over what to spend money on: NEVER COMBINE YOUR FINANCES. My wife and I have been together over 25 years and never had a joint bank account. We divide all the bills based on income percentage, and all the money left over in each other’s account is money we can do whatever we want with — zero questions asked. It helps keep arguments like “I can’t believe you bought another pare of shoes”, or “you paid how much for Jabba the Hutt” out of the equation. (Probably why she doesn’t give me grief about my 1/6 scale collection.)