I've rewritten this thread several times as I just sounded petulant. I also sounded like a child saying he did that and he didn't do that blah blah 
So for anyone who has had cancer or similar serious health issue, and has felt really let down by someone you thought of as a good friend, how did you deal with it?
I appreciate I'm maybe rather sensitive atm. I've also got a lot of time on my hands to worry. But it's really really bugging me how this friend has just been so lacking.
And I understand people can't deal with it, don't know what to say etc etc, but we had a really close friendship and I thought they'd be much more emotionally literate. I'm very open, I've not shied away from talking or people. I've made it very clear I want company, either physically or via messages. But this friend is just sending occasional very superficial messages.
How do I move on from this bugging me? Do I tell them (and risk a row) - they live a long way away so it wouldn't be face to face. Or do I just suck it up? Can a friendship be the same after one feels really let down by the other?
This is just one friend. I am surrounded by many many people who have been simply amazing. Which makes me even more annoyed at myself for wasting energy being annoyed at them!
Any insights would be gratefully received.