Welcome to the forums!
I read your other posts about your friend.
We can't fix your friend. We offer support and information to people that are affected by someone else's addiction.
The threee C's of addiction:
You did not cause it
You can not control it
You will not cure it
Even if your friend hits bottom and gets sober, that doesn't mean he is cured. Sobriety is not a magic bullet that transforms jacka$$es into gentlemen.
Have you attended Alanon meetings for yourself?
Have you tried to cut all contact with this person, for your own sanity?
As to your concerns about blackouts and memory loss - alcoholism is progressive. It gets worse, not better. The memory loss can become worse and could be permanent. It can also be a form of denial. Selective memory.