Wow what a terrible thing to happen i'm so sorry. Please know that we don't have to consider people like that our family - that sort of behaviour denies them their right to have us as family. You need to understand that you're not to blame and that you were the victim here. He's lost a wonderful person he could have had as his sister. He'll have to live with the regret of his own stupidity, you can eventually move on knowing that you have the common decency never to do that to someone. I'm not sure where you stand in terms of the law but it might be worth calling the police; especially if you know this man to have other people in his life who might be vulnerable.

Please know we're here for you, you suffered an ordeal and have every right to support and advice. All the best to you.