I'm so sorry. It's true though, about taking the opportunity to hang out with people. Something I regret terribly when my great grandma died. I never took the time to talk with her. I hope you feel better soon, though I know it's easier said then done.
I am truly sorry for your loss. That is so tragic when someone feels there is nothing left to reach for, but it was his choice, and you can't blame yourself for his actions. I unfortunately have had a few friends take their own lives, and I know how blindsiding it can be. Take time to sort your feelings and rely on your friends to help each other try to make some sense of things. You can always get hold of me if you need anything man.
Hey man, please accept my sincerest condolances for the loss of your friend. I wish you all the strength in the wolrd in dealing with it. Try not to dwell on the times that you didn't spend together and instead remember the good times in which you did. I am sure those meant a great deal to him.