Untidiness can be a problem in a shared relationship especially if it develops into hoarding. However merging two households worth of stuff into one is inevitably problematic. It needs a joint conversation and a fair agreement on storage arrangements and tidying up frequency. If your partner has moved in permanently, and you are living together as a couple you will need to discuss whose stuff is to be kept, what is to stored, why, and for how long., And what is to happen to surplus stuff?. Many women have and feel a need for significantly more shoes, handbags clothes, and toiletries than men which will need a storage solution proportionate to the available space. Most of my tidying and cleaning up is done at the weekend as I am at work during the week, and work very long hours, but I do load the dishwasher as I go, and put dirty. stuff in the laundry basket. The ' can't be bothered' approach has occasionally crept into my life when I've been depressed, which fortunately has not been too often, but I am aware that others find this difficult to overcome especially if it has become habit forming. I recommend you have the conversation but fully expect to compromise on the solution. You may have to be willing to get rid of some of your own stuff and to provide more storage, to pave the way to an enjoyable life together.