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OP, you remind me of me when I thought the man I was involved with could be "changed" by "helping" him clean up and get organized.
Hah.
The problem goes deeper than clutter. It's psychological and you will never be able to change him. So yes, you should keep your own place and leave his stuff alone. To him it is all "good stuff" and he won't part with it.
If you let him into your home, he will start hoarding there too. It's a disease.