I don’t even know anymore, relationship help

So today was my son’s first birthday. He is an extremely difficult and exhausting baby. Today for some reason was especially hard. My husband and I have been fighting for awhile now, and him on top of my son’s stuff is just leaving me with nothing left to give. I also feel like my husband needs to treat me better and he isn’t always the nicest. Tonight knowing that today was rough for me, basically mounted me and was trying to initiate sex. I said “no no no no no no” because I was not in the mood or feeling emotionally connected to him. He got up and said what’s wrong with you and then went upstairs. I went to get my pillow because I now wanted to sleep downstairs and he couldn’t believe I was upset by that. Acted like he had no idea anything was even wrong or had been said. Then he said our marriage is failing isn’t it? Sighed, then went upstairs. What would you have done or how can I handle this?