Falconbird, I can understand what you're saying. After my DS went through a pretty bad time (of his own making, but nevertheless he was hurting badly and as a consequence, so was I).
I found that now, 5 years on, my overall happiness relied on knowing that he was ok. If he was ok, then so was I. If I hadn't heard from him for a good few days, then I began to become really anxious, and one day made the mistake of texting him and saying something like, "I'm alright, by the way - are you?" He replied quite snippily, saying he was perfectly fine. Later that week his partner told me that my trying to contact him like this made him really angry, because he felt I was checking up on him - which I suppose I was.
I now leave him to contact me. As he said, there was no need to be always in touch, as long as we're 'contactable'.
This isn't really what the OP was getting at, I know.
There have been times when I've felt that I'd like to have a wee cottage, of which no-one knew the whereabouts. I could go there when I needed to get my head together. I think many of us feel like that at times. I would always need to be able to leave it, and come back to them all, though.