Yeah, poor Wilson indeed. :( First he thought House hadn't cared or trusted or whatever-ed him enough to talk about having cancer, then he realized House had withheld important information and then let him believe a lie just so he could "get high" and possibly harm himself, and then his attempt to reach out was snubbed in favor of the fellows (which you know he'll find out about one way or another).

Because Wilson never actually saw the file

Oh, hm. Better than anything I've come up with so far, although I'm still not convinced. If I were Wilson, well-trained by having been friends with House for so long, I'd've found out exactly what was what. And then lectured him about it called some friends in the field to make sure he got the best treatment, even if House didn't even bother to share the "bad news" with him.



Telling Cameron was foolish in a lot of ways (though dramatically necessary)

Dramatically necessary -- nah, don't cut 'em the slack. The Wilson-tells-Cameron thing could've been avoided if the story had been rearranged just a little. The writers should know better than to box themselves into a situation where Wilson had to tell Cameron. Either they wanted Wilson to gossip with Cameron about this for a specific reason -- and maybe the rest of the scene that got cut, if the line that made it into the preview indicates trimmed footage, would have made this clearer -- or it was sloppily done, because the story could just as easily have been written so that Cameron found out before Wilson or in some other way.