garrett
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We avoid issues like that Garret usually by her buying me something cool, me buying something cool for her or we just decide to do something together. We've been pooling resources since about 30 years ago when she was in the fashion biz and modeling, and I was trying to make it in music, and neither of us had a pot to piss in (something we always remember). Now that both have been doing quite well we still just pool the money and it's usually the other person saying, "Go ahead and get X or Y". Of course there has to be trust nobody will abuse the cash but we've never had a problem with that for over 30 years.
I absolutely don't fault that approach. It's worked for my parents since 1965. We've done it both ways, and my wife and I are both happiest with the split money approach.
Funny thing: I've read a few times over the years that financial experts recommend the split money approach. But very recently, I saw something from a very prominent source recommending to keep all your money pooled together. I guess there's no right or wrong answer as long as it works. I'm of the opinion that if you don't have trust and a mutual give/take, nothing's going to work.