I lived alone for a five and a half years and it was nice that the only bullshit I had to deal with was my own. As I have gotten older I have gotten way more OCD. If I lived with the me from 10 years ago now, I would be flipping my shit! I would leave the dishes in the sink for weeks, do my laundry once a month (more difficult to be motivated when you have to use coin laundry) but I still was relatively tidy otherwise. He has no sense of aesthetics which is another irksome thing, but I guess everyone sees the world very differently, and things like clothes and dirty dishes all over the house, receipts and various other things out of his pockets on MY dresser, not hanging up the towels, not wiping up the counters after making food, etc. are not even something that he notices. It was worse when his 20 year old son came to visit a few months ago, because he is EXACTLY like his dad, and I was constantly having to clean up after two mega-slobs.
There are many benefits to this relationship; just posted this as more of a rant. We have both been pretty sick the past few weeks, which definitely affects our moods and psyches.
Still think he is a man-baby, but I think there is little chance of him growing up as he is 47 years old.