My fiancé has been in such a shitty mood all day. My day has already been stressful with what we…

My fiancé has been in such a shitty mood all day. My day has already been stressful with what we have had going on. He's just been so mean. He's even been short with the dog. Then tonight the dog didn't listen when he told him something and he shouted "I can't stand my family sometimes". It upset me. I told him he needs to take a step back and look at how he is acting but he turned it around on me and said I don't have a say bc I don't bring anything into the house. Then he stormed out. I know I have my moments of being bitchy, but I realize it. Why is it so hard for him to see when he is the one being a jerk? I'm so tired of being blamed for everything that goes wrong or when he is frustrated. It stresses me beyond belief. I could scream.