No, you are in control. Yes you can't stop a D, but he will need to be really determined and in the face of someone just being nice saying, "I really don't want this, I am strong on marriage preservation not walking away (AKA it's your journey)", he has to do the heavy lifting!
If he has to do the heavy lifting you have no "load" on this matter, I don't see your position as hopeless. I see it as hopeful. He might struggle under the load and give up and try to reconcile and if not, its still not your load. Be kind, but just don't carry the load. Also, remind him you have enough going on with S, baby, work, you can't find time for something you don't believe in now more than any time.
Surfer.
M46/W40/D8/S6/T20/M12/Separated 6/2016,W takes kids Issues2009 Wpartying w/g.f's2013on EA2013PAdeniedWleavesMBR ImeetAP/EAhalts VariousBDDates MFCourse WSpew EAresumes I halt Wrages DBIng4/2016