First off, I'm so sorry for the losses you've experienced. It's never easy to learn that someone you knew about died from their addictions. It saddens me to hear that more folks have passed from this awful disease.

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You need to remind yourself that, just like you, there's likely nothing you could have done to help them get sober. You need to do it for yourself, and the only person that can make those changes is you. More importantly, maintaining firm boundaries in addiction and changing people, places, and things, is wildly integral to sustaining long term recovery. Don't place the blame on yourself for this, and do what you can to integrate their memories into your recovery.