I’d wager he trusted his friend to do the right thing. I know I’ve helped people in the past, and there isn’t anyone who knows what I’ve done other than that person, me and God.
For me, I think it’s telling that she was unwilling to reveal the contents of what Cain wrote to her. If there’s smoke, then let’s see them. Cain was willing to open them all up, which tells me that he was pretty sure there wasn’t anything there.
Now, for those of you who weren’t there - Cain’s grandchildren were receiving death threats. That is why he pulled out, to protect his family. Even his own bodyguard resigned, stating that he wanted Cain to have even more protection than he could provide.
I see a whole lot of circumstantial evidence, with nothing solid.
I helped my own ex-wife out several times. I didn't hide it from who I was dating at the time. I would never hide such a thing from my wife.
Like I said, it was stupid on Cain's part to not clear everything with his wife before getting into the race. It showed he had not thought through what he was getting into, even if the money he gave that woman was done without any underlying affair.