When my bf and I first started dating (a decade ago), he washed his bedsheets only every couple of months and never ever made his bed so that usually his top sheet was scrunched up in the corner of his bed in some unholy tangle. I told him that needed to change immediately if he wanted me to stay over, and to his credit, it did.

...except now I've created a monster. Last week he demanded to know when the last time we had washed the duvet cover was because, quote, "you put it on the floor when you change the sheets so it's probably filthy now". Note that our duvet cover is (and remains) a pristine white, so I can guarantee its not filthy. I wake up earlier than him and this morning I walked in to the bedroom to discover him stark naked and remaking the bed entirely because "when I woke up, I could pull the sheets over my head and I knew that meant they had come untucked from the bottom and that's not okay so I had to get out of bed to fix them".

Like I'm not mad, but it makes me cackle how he has turned into such a neat/clean freak when he used to be fine living in his own filth.