I have to say me. I would spend way more money if SO didn't set a limit for me. I always feel like we need something. I use to call SO cheap, but now I am thankful he is. We finally have emergency money.
SO would, if I let him lol. Because of his spontaneous spending at times when we first got together 5 years ago, I being frugal, I took over the money lol. I'm not a huge investor or know the ins and outs of money saving, but I know that bills come first, followed by necessities, some stashed in a savings he isn't even aware of, then fun money lol.