without him knowing.. take his name off everything. If it was origanally yours, you can do this. If not, then take your name off.
If he lives with you, then you need to enlist the help of some friends and maybe the police.
Timing is everything. You have to make this plan and enact it in one days time or risk being found out. K?
Talk to a few friends. The more guys you can envolve the better. Hopefully they drive trucks. Don't tell him that you are going to take a day off work, but schedule a day with your boss... You may even want to tell them enough so that if he calls when you are not there, that they don't tell him anything to tip him off.
In the morning when he leaves for work, have your friends waiting and then come in ready to go. While they are boxing and packing you out of the place, you set down and call every creditor you know and cancel or close, or take your name or his name off of everything. DON'T leave anything un done. After you have taken care of the finacial worries, help your buddies move you out. Hopefull that won't take too much, but once it is done and you are out, you have to file a restraining order.
From the sounds of your post, this is NOT a nice guy and will do much to cause you as much harm as he can. Don't let his threats keep you in this relationship any longer than it takes to work out a plan to get out.
And, DON'T try to do this on your own. Although you might be able to pull it off, it will be worth it in the long run to have big men there, just incase he comes home early for some reason. IF he does, call the cops. Don't play, just do it.