This sucks. But a lot of his actions aren’t the coke in my opinion. Cheating specifically. And his assumption about only crackheads and heroin users being addicts is unfortunately a common theme in groups of addicts. I’ve been guilty if it myself as if bring a coke sniffer in 8th grade wasn’t an extreme problem. Drugs are rough and addicts are very unlucky. But some of us can and do change.