I think that your own sobriety needs to come first and if he’s drinking and hiding it the anxiety of living there that way is not good for you. I know you were very concerned about breaking a lease but you need to find that strength to get out and away from this situation.
I know you don’t blame yourself for his drinking the blame on yourself is the fact you continue to remain there in this situation which is growing worse.
Is there a way to split the cost with him of breaking your lease?
None of us want to leave the person we love and wanted a life with but when it becomes toxic to us it’s a matter of saving ourselves first and getting ourselves onto healthier ground.