I am sure it means very little coming from a stranger, but his death, though very painful, was no fault of yours, though I know you wish it was. Blaming yourself gives you someone to blame, because you cant blame a dead man for his actions, and you feel like you should have been able to do more. I know that feeling sweetie, I've been there before. His actions were his own, and it is not your fault that he killed himself. If anything, it was your love that kept him living so long. Remember your ache and pain in your heart over the loss of your friend, and let it teach you to never, never make the same choice in your own life. My best to you.