Sad newbie here!

Hi guys! Never thought I'd be on here, but I guess no one does when they get married and make that commitment. A little background, we've been together since we were very young 16 yrs old. Basically 15 yrs., we finally got married 4 years ago. THat's when it went to hell. I waited so long to make sure he was the one. We both did stupid things when we were little, but we were kids. Since we got married he's developed an alcohol/drug problem. Disappears on weekends, randomly. Comes home at 9am the next day and has no idea why I'm mad. HE gets so messed up that he passes out everywhere. But its only when he drinks, and he doesn't have to drink. We fought about it for the past year and he recently did 6 weeks, no alcohol. Well this weekend he drank again and disappeared. I have no idea where he goes. I have seriously thought about putting a GPS tracker on his car. But then I don't want to be brought down to that level. I have threatened divorce several times this year and now I think I'm ready. I don't have kids, and have a great career and don't really need this crap. I want a professional grown up sincere honest man-- does that exist anymore?? Anyway, I'm fed up and ready to move on! He's also probably ruined me financially...