Familiar. Just when you think you can't stand anymore, you will allow it, playing back moments when he's sober, think you might be the one blowing things up and maybe you are the crazy one.
I get the drinking so he has less to drink, or to make it easier to be around. It's like trying to stretch your tolerance so you can wait until he gets better. I know I thought that, we hold onto threads of hope certain moments, only to have them cut again.
The reality is that the chances of him getting better are really slim. He doesn't see his problem, so, I'd say playing the lottery is a safer bet.
If there is no way out of that lease(both signed?), I guess paying your half for 11 months is out of the question to leave, sticking it out may play hell on you and your kids. Not a great situation, but you can use the time for personal growth in detachment and near the end teaching kids how to respect yourself and leave a bad situation.