I'm at a loss...

So we have been together for a while. engaged for over a year. our wedding is 10.17.2020. we have been trying for a baby for a little over a year. today, playing with my month old niece, he told me he doesnt want a baby anymore. also, hes been talking about not wanting to get married. every time I try to bring it up and talk about how he feels, he shuts me down and assures me this is still what he wants. what should I do?