Congrats on the 40 days!!!
I am sure if you were to look at it from your husband's perspective, deciding to file was probably also difficult... but unfortunately his mind was likely made up long before you became sober. Fact is that divorce is a common consequence that arise from one's addiction... My wife is at 60 days of sobriety, just about to come out of transitional living and return to our home. We have defined several boundaries as her behavior while using was unacceptable to me, and I will not tolerate it again. She knows she dodged the divorce this time round, but she knows it is a consequence of her addiction if she can not maintain sobriety.
Regardless of what will/may happen in the future, keep focusing on your sobriety.. without it, you truly will have nothing in the future.