I don't know what to do anymore

I want to save my relationship I'm 24 weeks pregnant, and I think my boyfriend is getting out of control, I gave up my job so I can focus on my pregnancy but thats when I started to lose more control of him, and so I started to work again, we were late on our car payment but paid it 3 weeks later. I think he's falling back into addiction snoring pills behind my back, there isn't any love in this relationship no more. He constantly late he's bringing me to school and work late. I don't know what to do. I just wanna be happy. I want to fix things but I don't know anymore.