How do I handle running an office and someone's whole life?

You moved into a chief of staff role, and the job grew teeth. Now you run an office and its politics while still holding another person's whole life together. That is two heavy jobs braided into one, and feeling stretched by it is not weakness. It is an accurate read of how much you are actually carrying. The hard part is that neither half fully lets you go. The office needs your judgment and steadiness; the person you support needs your reliability the way they always have. You are the hinge everything swings on, and hinges rarely get thanked. Naming that clearly, at least to yourself, matters. You are doing a genuinely large thing. But you cannot be the load-bearing wall for everyone and everything without it eventually cracking you. Get deliberate about what only you can do versus what you have simply always done. Hand off, automate, or drop the rest, including tasks you have carried out of habit. And find one person who supports you the way you support everyone else. Start this week by writing down what is actually yours to hold. You will lead better when you stop carrying what was never yours to begin with.