Boing
I think you have to consider what your relationship is like generally with them - do you keep in touch with each other anyway or only now and then, or if something has happened or is planned eg. operations etc. You can be the kindest, most considerate person who checks in with others but that doesn't mean they will mirror that kindness and consideration back. Our expectations of others is what causes the bitterness and upset when they don't reciprocate. I have come across this so many times and other people have said the same thing to me, so you're not alone.
The world has changed sadly. People tend to be caught up with their own lives and although keeping in touch is easier now, more often than not it's only when someone wants something from you that they make the effort. It's taken me a long time to realise this but once I became aware of it I noticed it was always me that made the effort - I don't do it anymore x
Boing I completely agree and was going to write something similar especially your last paragraph. I heard again on the radio yesterday, someone talking about how the UK, possibly the world, has changed since the pandemic. People seem to have retreated into their families, become somewhat selfish and unhelpful/supportive to others.
I have spent the last year supporting a friend and a close family member and her family through unpleasant breast cancer treatment.
My own troubles have been ignored when they have arisen, silence, and the fact that I messaged on the day of a breast removal without realising it was actually hostily rejected. This has become the last straw for me.
Along with the disappearance of common civility in the streets and shops, careless driving, no one seems to bother signalling or waiting at roundabouts any longer, I'm sick of it, I've gone into selfish mode myself. It is sad, as others have said, make the best of your own life.