Welcome Clara! You have our support and just reading through this thread you have lots of great input on your situation.
As a recovering alcoholic....all I can say is focus on you and your recovery. You need this for yourself and all good things will come from that. You have been through a lot and all of these life changes can weigh on us and if our sobriety is shaky.....it opens the door to relapse.
I emphasize that your #1 focus needs to be your recovery and if this relationship works out as a result great and if not....you have lost nothing and have gained everything.
You are a better person as well all are in sobriety....You can do this.