By Anonymous - 02/10/2015 10:22 - Australia
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His sister might have known, or at least had a suspicion of what was going on with the brother and the girlfriend but was worried that OP wouldn't believe her if she told him, a friend of mine did something very similar for his best friend. If so this was an ingenious way of doing it without having to be the person to deliver such shitty news or risk looking like you're trying to interfere.
He's obviously guilty. If he admits it, he's in trouble. If he denies it, he knows he'll get caught lying in the future. If he was innocent, there would be no problem with him claiming that he was.
Moments like these make me really appreciate being an only child.
Why would you do that in the first place? Even if she wasn't cheating on you, that's ruining some trust.