Dear Zebra Safari~
One of the things about any partnership that is gong to work is that both parties have to understand and want the best for the other. Your BF's current illness was unforeseen and you have to take action that takes account of this new problem.
I would imagine when he is better he should be able to accept that you still loved him but had responsibilities to your children, they can't live in limbo. On top of that you had to consider if the current situation itself was contributing to his illness. So setting things up so you had accommodation for a while is simply a pause to get things in order - his medications for one thing.
There is one thing I can say, my partner took over a lot of the burden of everyday life, of household matters, decision making and so on. This opened my eyes to her great capabilities and resilience. our subsequent time together benefited from my realization that I could lean on her, and in better times she could lean on me.
You are making sensible decisions and are someone that can both support and be relied upon too.
Yes each text might take energy and focus, but speaking for myself even when in a bad place the knowledge there was someone there for me made a big difference. If you balance that against the energy of contact I think it is no question. My partner had to learn what worked, when not to pressure or make suggestions, and how at other times exactly the same thing worked well. Not easy for her at all. I'll always be grateful to her.
It does seem a terrible open-ended long time, I don't know anything that would make it any easier, perhaps talking to a friend regularly might be the way to go.