Most Helpful Guy
No, I think you're 500% right. I think you're doing the right thing by attempting to turn him away. Nothing good can come out of letting him back in your life, even if it's strictly as friends.
Most Helpful Girl
He many genuinely be sorry and want to make amends, especially if he's been getting clean. But this doesn't mean you need to let him back into your life. I'd accept his apology, wish him well and ask him not to contact you again