I think that giving him "credit" is exactly what he wants. He hasn't been drunk or abusive in the past 4 months. Because of his history that may look like a real accomplishment on his part, but it isn't. It's how most people live their lives ALL THE TIME, not just when they're trying to weasel their way back into someone's good graces.
Take care free. You deserve to be this happy all the time, not just when an abuser decides to allow it for awhile to serve his own motives.