I hope your evening turned out to be okay. Disappointment is tough, but it was very nice and important that he shared with you his reasons for needing time for himself. What do you think about asking him your question, what if you were married? How would he handle it then? Good question.
Does SO have proof of his shared support? Is there an existing order? Many times what doesn't go thru the courts doesn't count if it's not on their records. It sure is great that he's been doing more than his share already, that shows good character.
As hard as it is, the only one that can take care of us is us. We can hope and ask, but it's only us. It always comes back to that, doesn't it?
Live your life while you are still living. Riding the trail less traveled.