Relapse can do strange things to people. After 9 months Im sure there is a lot of guilt and shame. Not to mention if he has not come to a point of stopping this run, then pushing those he cares about away is a really common scenario I think.
My husband did that to me when he fell apart one time.
My guess is that he will come back around. This is part of the emotional rollercoaster that affects both people in the relationship. All I can really share is how I handled it. Try to stay emotionally calm, figure out how to manage day to day with the expenses and what has to be done. When I was able to talk to my husband I reinforced the support systems we had in place.... family, friends, therapists... and that this could just be a blip that was worked through.
But think about if its something that you want to go through. Its ok if you don't.