Let's assume for a moment that all these red flags are real. Because they likely are.
Let's assume he's active in his substances again, which means it's only going to get worse, as addiction is progressive.
Are you clear in your mind what actions you will take to protect yourself? Do you have a plan, a discreet set of actions to take?
99% of the time, those niggling doubts we feel about the addict are based in some truth. And usually, it's a truth we don't really want to face.
I found that if I wasn't clear in my own mind when I was going to listen to my gut, and if I didn't have boundaries defined to myself what I was willing to put up with, then I would get confused and damaged, being sucked into the wake of addiction. I had to learn to think ahead, and make plans for each contingency, and hold myself accountable to my plans.
CLMI