He has become abusive over the past year - one week of "sobriety" (the quote marks are deliberate - so far he's just "not drinking") isn't going to reverse this. If he's serious, he can wait as long as it takes for you to trust him (assuming you ever do - its not like you have to go back ever if you don't want), and work on himself at the same time. Please take care of yourself and your child, and let him take care of him for now. There's no hurry to fix anything just at this point in time.