Hi, and welcome.
Someone else's alcoholism is hardly a trifling whim. He's got a long LONG way to go before he is this "hero" you have in your mind.
What you do has nothing to do with why he drinks. If you had been there, the most you would have done is postpone it for a short time.
You are romanticizing his disease. I'm not sure how romantic you will find it when he starts to pee in the bed, when you are supporting him financially because he can't hold a job, when he winds up in jail again, when he becomes abusive because you are trying to stand between him and a drink. Because that's where this is all likely to wind up.
I suggest you get to Al-Anon. You may have worked as a therapist, but it is fairly clear to me you are not familiar with the course and effects of alcoholism. If you stay with this man, you are in for a lot of pain and anguish.