1. Time apart. Neither break up nor let him back in your house. He can stay with family, friends, a roommate, or in rehab, a sober living/working facility, extended stay place, rental, or house of his own. Hopefully, it won't come to the last three places: institution, jail or morgue.
2. Recovery. You go to Al-Anon/Nar-Alon meetings and work the program. You will learn to stop enabling and being a codependent, among other things. You will stop worrying about his recovery, and only focus on keeping your side of the recovery street clean. Keep reading and posting here too! Will you feel lonely, sad, miss him etc etc.? Absolutely. He will miss his DOCs for one and you too/two ... until he recovers (give it a year to two minimum) to the point you become first again!
3. Continuing sobriety and working the programs. That must be priority #1 in your future relationship if there is to be one.