You never ever have to feel guilty about being burned out, that's just a temporary state of being in response to extreme stress and exhaustion. (I even think of burn out as a form of self-protection, it's like the brain and body get a little numb and checked out to prevent you from operating at that high level of stress and energy.)

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If it helps at all, this is way beyond your skill set! I am not saying to stop caring or trying, but it would take an experienced mental health professional a very very long time to make progress with a serious hoarder. You can't be expected to solve this.

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My best piece of advice to you would be to take time out and away from both homes when you can. You sound lucky, to have a good friend and a boyfriend. Find ways to really enjoy life away from that hoard, preferably in nature. Go for long walks, breathe fresh air, be in open spaces.