I used to live with someone who could only be described as a 35 year old child... I would clean and tidy every day, make the bed, put everything right... and then go to work... I would come home to find the place in an absolute state all over again. I wouldn't describe myself as a clean freak, but it was exhausting to have to come home to that every day...
When I was away from home for longer periods, it was even worse. When I lived alone and knew that I was going away for a number of days, I would change the bed linen, clean and tidy everything - so that when I came home I could just fall into bed and not worry about dirty dishes or washing clothes. With him, it was like a toddler had been on a rampage... I would find sweet wrappers shoved down the side of the cushions of the sofa, a mountain of dirty dishes...
He was university educated, but had moved straight back into his parents hotel after finishing, and as a result, his mother waited on him hand and foot for ten years... He just simply didn't have a clue how to do the simplest of household tasks...
It seemed like a bit of a joke at first, but it was emotionally wearing and I really grew to resent him, as it felt like he didn't care about me or my feelings... but I actually think it was his mothers fault for babying him...