My husband can't handle being a dad

I have a teenager from a previous relationship so this isn't my first rodeo. My husband and I (married 7 years) welcomed our baby 4 months ago. My husbands really struggling which, on one hand, I understand. But on the other, I don't understand. Here's why. I am off work for a year. I work a very part time side hustle to bring some income in. Because I am off from my full-time job, my husband deems it appropriate that I do most of the childcare, housework, laundry etc. I do all of the night feeds and have done so since my husband returned to work after his paternity leave ended (when our baby was 6 weeks old). My husband proceeds to nap most days because he's so "exhausted". He gets a full night sleep. Every single night. I don't doubt that working full-time is tiring but, I'm literally a walking zombie all day everyday I'm so tired. I'm on the go 24/7. He thinks a break for me is showering or doing chores. I currently have anemia and have had boughts of dehydration which doesn't help, but I still keep going and I don't complain about it (except now). My husbands getting ready to leave because he can't take it anymore. He just cannot handle being a parent and hates his life now that he has a baby. I was saying how blessed we were in 2024 and hoped 2025 would bring more and he pretty much stated that 2024 was the worst year of his life. I take it very personally as I carried and birthed our child. I don't know what to do.