My ex, after we broke up, used to have a deal with a girlfriend to make daily contact and if it didn't happen, they would know something was wrong. I imagine that is still going on.
I once asked Jenny if she would like us to have a formal thing like that - with all her health travails - since our natural contact ebbs and flows - but she just laughed it off.
Interesting thing with me not long ago. One day I was late for work and didn't call in right away - car trubbles ----> Harmony immediately started looking for me. Like she had the boss call me and whatnot. That same morning.
I guess I am just that freakin' reliable (predictable?) that any variation seemed actionable. She was worried.
I was gratified and told Harmony that was very nice. Dying is always a possibility and I live alone at the moment and I would prefer not to stink the joint out.