Addicts do this. Any reason to use. You didn't cause this. This is not your fault. He was an addict and he chose to use.

Never shoulder blame for having boundaries. The idea he was mad at you for having a boundaries tells you he was already using. He was just getting away with it and managing.

One of the things they teach people in recovery is that the damage they did as addicts is still front and center for the people and family. That we do not have to forgive and forget. They talk about that A LOT.

He was not working his program if he was all " this in the past, I'm clean" truly recovered addicts will tell you they are always an addict. They just can't ever use again. The desire is ALWAYS THERE.

I'm so sorry for your loss. You did not cause this! You were right to have a boundary. You were allowed to have boundaries! He should have known and respected that if he was actually working on staying sober