Shit, that just sucks. I feel for you. It's really hard when someone close to you takes their own life, because you end up thinking "Is there something I said or didn't do that caused him to do that?", and you end up with feelings of guilt on top of the sadness. It's also easy for us to say "Why would he do something like that...there's so much to live for" etc. But we can't get in his head, not now anyway, and there isn't anything you could have done to change what happened. Get some rest, be around people you love, and hang in there...good days will come again.