It's the difference between independent and interdependent (and co-dependent, but that's another story). Would I be able to maintain my current lifestyle, if my partner and I were to break up? No. Nor would he. There have been times where he's shouldered more of the financial load and I look forward to my turn. It's part of being a partnership instead of being on an island. And count me among those who thought of A Practical Wedding, who had a post today about pre-nups that's also worth reading.
This goes into all the reasons I am a terrible thrifter/vintage shopper. I love vintage clothes, but I hate the hunt. I like to go into a store and stand there going, "HAAAAAAALP." Which is ironic, because I am a personal shopper. Literally. But, yes, all these rules apply to regular shopping, especially when it comes to shoes. Men's/boys shoes can be cool and cheaper than the women's equivalent. Just size 1.5-2 sizes down and you'll be OK. But a caveat: DO NOT buy worn shoes. DO NOT. EVER. They're already broken which means they'll never break specifically for your foot and can cause foot/gait issues that will mess up your feet, legs and back.