Relationship troubles

So i am devistated right now my fiancee just lost his job... in the not so long ago past he could not hold a job. He wont be allowed to use his cdl bc he has had 2 jobs with in his first year. I have always been the provider until 5 mo ago. I had our 3rd baby and he told me to focus on my nursing school bc he has his cdl..... so my fear is that things will go back to the way they were before. I was about to leave him due to him not working and i was a 9 month pregnant woman working as a cna. Things can't go back. Im so scared right now. We seemed to be getting it together just in time for it all to fall apart...