I'm so sorry for your loss. I have to agree with what was said above - he didn't do this to you and your friends intentionally. I had a dear friend commit suicide, years ago - had nothing to do with drugs/alcohol, but everything to do with his inability to reach out for help. It hurts, and anger is one of the feelings we go through. My friend had a young daughter, and I kept asking "how could he DO this to her?!?" In time, I remembered how much he adored her and though it's still sad, the anger is gone.
It takes time, but please know we are all here for you.
Hugs and prayers,
Amy