As Lillamy said, talk is cheap. My AH got a DUI is past February and went through the typical remorse stage immediately following the arrest. A few months later he was drinking and hiding it, driving on his suspended license to go buy more beer, etc.
He was encouraged by his psychiatrist to go to AA and he just avoided anything that would hold him accountable. Basically, I've had to learn to watch what he does instead of listening to what he says. I'm sorry you're going through this, I know how miserable an experience it can be. Now's the time to focus on you and come up with some good boundaries.