I have consumed so much reading material about cancer itself, that sometimes I don't make any sense to my partner. I also get the "that's neat" type of responses, then I go to any cancer website and discuss instead.
I'm starting to learn that I have to pick and choose what I want to talk about in regards to cancer to avoid feeling that upset feeling. I just can't expect anyone else to understand what I'm going through.
For me, it's like my brain is orbiting around cancer. For everyone else, their brain is orbiting around my mortality when I talk about it-- it really leads to some flat, one-sided "that's neat" type of conversations.