@JoysOfString - so much stuff here that I recognise!
The problem with a man like this is that the harder you try to make it easy for them not to be a dick to you, the more frustrated they get, because they need to be a dick to you. If you act as if their "mistakes" are mistakes, and you really want to try to help them not to make them, and you invent all these systems and conventions to help them not fuck your stuff up, you are making them more angry deep down and things worse for yourself long term.
I feel an intense relief reading this thread from seeing the basic understanding.
In my case it wasn't so much about breaking things - though things got broken a lot. It was about putting things out of reach, or where I could not find them, but a different place each time; resenting me having personal, rather than household, possessions, and getting cross with me for expecting them to be treated as such.
I would attempt to combat this by for instance having duplicates of things, which I didn't care where they wandered off to, but that wasn't the point - the point wasn't that he could always put his hand on anything he needed or wanted; the point was that I had nothing that he didn't have access to.
A lot of it was about tools, which I think is funny as it is so Freudian. My having tools was a direct challenge to his masculinity. I didn't attempt to keep them from him at first - only when I could never find them, or if I could, reach them. So I did things like buy "kitchen screwdrivers" in other words, leave my stuff alone so I know where it is when I want it. In the end, the last line of defence was my swiss army knife, which my parents bought me for my 21st birthday, and was in my knicker drawer. I was not supposed to keep that from him and it was to be called "the swiss army knife" not "the swiss army knife". I was SO busy doing EVERYTHING and I spent an insane amount of time a week looking for stuff he had taken and perhaps broken or at least slightly damaged.
I was not supposed to be able to find my hairbrush and it was considered unreasonable for me to expect him not to allow the 3 year old to run off with it and lose it in the garden - when I was working full time and trying to look good every morning and he was a "SAHD".
There were so many things wrong but this thing was on paper the least really - I can see "reasonable" people dismissing this - of course things get moved in families! - but not having to deal with this is among the biggest reliefs of no longer being with him.
OP - put everything you care about away for now and get it out when you've got rid of him.