This thread sums it up nicely. Everything you need to hear has been stated by you and the others.
Let me ask you this. If you think it is hard to leave now, do you think it will be easier in 5 years? How about in 10 years? 20 years and 2 or 3 kids later? Will that make it easier?
I wish I would have known of my alcoholic wife's alcoholism before we married. But I didn't see it. We didn't live together. Essentially, we had a year or so of romantic weekends. I assumed she didn't drink during the week. I was wrong. it got worse. Much worse.
And now, 22 years and $100K later, I am still dealing with a drunk. It is not fun.
Pack your stuff and go. What are you waiting for? There are what, 2 billion men on this planet. There are some nice men out there. Go find one. He's looking for you right now. And he's not at a bar.