<human>: Let's call the friend with cancer Josh. 

I never asked to be told about the fact that he has cancer. It came as a complete surprise when someone mentioned in passing that Josh wouldn't be able to make it to a party because he was getting chemotherapy. I felt as though the rug had been pulled out from under me. I had no idea.

What's worse is that, shaken, I asked a few friends if they knew about Josh's situation. They all did, and acted strangely bitchy about the fact that I knew, like I was invading his personal privacy by knowing. But, as I said before, I never asked to be told about this. I felt slightly betrayed, but since I don't know Josh's reasoning for not telling me, I don't want to jump to conclusions.

**My question is how I should react to this news.** Josh, for whatever reason, must not have wanted me to know. But at the same time, I feel obligated to be there for him. I want to help.

I know I won't be able to act completely normal around him with this elephant in the room. But I also don't want him to lose his trust in the friend who accidentally told me, because it was an easy mistake to make and he had no idea I wasn't in the loop.

Give me the gist of the text in a nutshell
<bot>: My friend has cancer, no one told me, should I pretend everything's normal, wait for him to tell me, or tell him that I know?