When you love someone and have deep attachment it can be hard to see through the fog.
You've been very strong over 6 months to have broken it off and held your boundaries, but he's persistent in roping you back in and preventing you from moving on. It's very controlling behavior and not respectful of YOU and your desire to have a healthy relationship with a partner who shows up for you, which is what it seems you want but he's not willing or able to give you.
Even if he goes into treatment, he has a strong chance of relapse, and he has a history of hiding things from you, and disappointing you. You've never known him sober, and sober-him may be a very different person. You truly have a gift right now of time and the ability to reflect on what you truly want in a relationship. We empaths with bleeding hearts often want to love and nurture our men into wholeness, but that's an inside job that he has to want.
Ghosting him to motivate him to get into treatment and transform himself into the man that can show up for you is a long shot. Ghosting him to give yourself the time and space to heal, gain clarity and potentially let in a new relationship with someone who can love you from a genuine and healthy place is a greater opportunity.
I know this is hard, big hugs.