Hi LostMunki,
Welcome to SR. You already got some really great advice. I know many of us have felt exactly the way you described. I have been where you were last night, and lillamy put it so well when she said it is a very dangerous place to be. Don't do what I did and let your sadness over his relapse be the beginning of a destructive addiction to HIS addiction.
You have come here which is a great first step. I didn't find this site until I was in way over my head. I never realized what an insidious and contagious disease alcoholism is until it was too late to get out without suffering major trauma and loss of self esteem.
Please take care of yourself! Keep reading on SR and go to Al-Anon. Education is key!
Hugs.