Hi lonelily. Glad your SO is getting help.
I guess my thoughts on it would be... There is some reason that you and he did not make it official yet. Give it good thought, and try not to do it just to cheer him, but because you really feel it the right thing to do.
just think on it and I am sure you will do what is right for you. Glad you joined us here at SR.. its a fine place!