I think you are in a natural state. You were badly hurt by H's actions and by trusting him. He will have to make you want to believe him again through his actions. Once you see actions from him, then you will decide if they are enough or if you need more...or if you can't do it.
It does seem as if your H has turned a corner w/his openness of his situation, but he is still getting defensive when you talk. I used to be very defensive myself, so I think I can understand how your conversations go.
One thing I learned very recently is defensiveness from a man is due to his feelings of inadequacy. Men want to be there for the people they love, but one of the ways we show our guilt, shame, and feelings like we're "losers" b/c we couldn't do it right, is to be defensive.
That makes all the sense in the world to me now b/c I was "Mr. Defensive" throughout my marriage but I didn't realize it was b/c I was feeling like a failure as a H.
Maybe that will help you w/H's defensiveness a bit. Doesn't excuse it, but may help you to understand it better.
