Sorry to hear that mate.
My best friend was a selfish prick back in the day. Stabbed himself through the heart in front of another mate of ours all in spite of life. Not caring for anything other than a drug and alcohol fueled existence led into it all. The other mate that he did it in front of is a mess too he is a street druggie now I believe, probably dead too .
Lost heaps of the ones i grew up with mate. One even got whacked.
You cant choose their lives for them my friend or expect them to live any way other than how they choose to. Such is life. If a few people learn something from it then it isnt all pointless I suppose.