Not even taking his personality and how he's been treating you into account, you need a partner that supports your sobriety and doesn't jeopardize it with their own actions.

If you break up with him, you do lose some things; that's true and it would suck. But if you stay he could contribute directly or indirectly to your relapse and then you could lose everything, including your life.

He may have had a really dark past and he's dealing with a lot of demons now, plus the sobriety issues, but that doesn't make it your fault or your problem. And if he's not willing to get help for himself, nevermind support you in your struggles, that's a pretty big red flag.