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Your dynamic goes like this: whoever's tired, the other one steps in.
You don't need a fixed role as the caretaker or the cared-for. If you're doing better today, you take the wheel; tomorrow it's their turn. That kind of trading off is rare, because it takes two people who are both willing to be vulnerable and both willing to step up.
Your dynamic goes like this: whoever's tired, the other one steps in.