how much time should I give him to start the paperwork?

My (36m) boyfriend has been separated from his (39f) wife for about 7 months now, i (25f) have been living with him most of this time but recently moved in around march. It’s been a little sticky and i want to give him his space to deal with it himself, but I really want to start thinking about my future, and kids. I don’t want kids right now but I’d like to start thinking about settling down. I was thinking, if the paperwork hasn’t at least been started by December or January, I would decide to move out when march rolls around again. Fair? AMA.