My fiance goes back and forth between understanding it's hard for me to do things because the baby…

My fiance goes back and forth between understanding it's hard for me to do things because the baby cries if I put him down for too long, on top of barely sleeping so I'm exhausted and then the next day he'll ask me to do 50 things and then be whiny because I was only be able to do 2 or 3 things. He's killing me. 🙄