Faru, welcome to the site. I'm glad you're here, but sorry you had to come looking.
You *can* get over this, but it will take time, and distance for you to get a good perspective on your situation. When you do, you will see and be sure in your heart that the things he will have to deal with are the consequences of his own poor choices and inability to deal with his issues. You will know for certain that all you would do by returning to him is delay the inevitable reckoning he will have to face.
You deserve so much better than you get when you are enmeshed with someone in active addiction.
I hope you stick around, keep reading, and keep posting.