Is this normal?

So my fiance has changed a lot since we had our daughter. He seemed like a great guy. Almost perfect. Then after our baby was born he decided that now he has to treat me like garbage. Nothing is ever good enough. He refuses to help me with the baby when I ask. His excuse is I'm her mother so it's my job. And yes it is, but it's his too. I didnt make her by myself. It's just getting to the point where I cant take it anymore. The constant disrespect is just too much. It's just that I've been with him so long and I still love him so it's hard to leave.

Update

I'm leaving him and he doesnt want our daughter