I think Ben would've been fine. I mean, I don't think you owe anyone your background, and I don't think he'd have felt entitled to the whole thing, even if he'd learned about it from that post.

[ Andy didn't know any of it. And it's not that he doubted Buffy's account— he didn't because Faith's the sort of person who'd have yelled bullshit if it had been bullshit, but also Duplicity gives people plenty of opportunity to be assholes while providing plausible deniability, and Faith hasn't taken any of them.

So while Buffy told the truth about what happened, she was obviously wrong about who Faith is now. ]

That said, Ben values honesty, and he's the most trustworthy guy I know, plus, it's nicer to let people in, I think. Give someone the means to hurt you and knowing they won't.