Ok, email sent, because otherwise I'll forget again. I was going to go driving and look - but it's hard to look at houses while you are driving. :P

It's true, it's not like the guilt is a secret, so Sam already knows that Dean has issues...but, I don't know, I think Sam would have to be blind not to see that Dean is really struggling these days.

Dean does not have a good track record for keeping secrets. I think his record is 10 episodes. This one seems like it might bubble over far sooner than that.