Respect that you are different people. Maybe you can reach a point of compromise. In every relationship there are things that people will never compromise on. One should recognize that in being minimalist, they are the abnormal one, and will probably be seen as such if the partner relates the issue. By default, unless people assign duties, the neater person will end up doing most of the tidying or cleaning because the other person never reaches their threshold of mess. Ask yourself, would you throw the Queen of England's stuff away? If not, respect her stuff as a private individual who happens to be putting her crap in your space. If you reach the point where you can't take it, maybe it's time to stop having the Queen as a bedmate.