Amongst the list of good economic decisions to make personally, getting a good partner is one of them although it is often exempted from the list and not mentioned.
I came across something that should have been funny and a joke, but I could not ignore it. Something about a woman bragging about making her husband a millionaire, and anyone hearing it would have been impressed at how virtuous and smart she is, but when asked what the man was before she met him, she said a "multi millionaire". Apparently that is the joke, but a serious look at that will tell you that the person you choose to spend the rest of your life with as a man and a woman will affect your finances.
A good man/woman will increase and help you multiply the resources you have, a bad man/woman will diminish your resources. This is why choosing should be done carefully.
It's very important that you go into a relationship and have an understanding of how the finances might play out. There is nothing wrong covering the bills on behalf of someone else if they give you things like emotional support or keep your home in good shape. It can also be good when you are both earning and approach everything with some kind of split, sometimes based on incomes it might be 50/50 or even 60/40. The thing you really need to be wary of is someone who spends too much money and gets deep into debt. You might be able to teach them a different approach, but it can be hard to snap someone out of bad habits they've accumulated over a long time and they really have to want to change too.