At the verge of divorce

Any other fellow first time mum who is completely shattered under the weight of how much your marriage/relationship has changed? I know they say the first year is the hardest and that it is a trial of how steady your relationship is. But my husband and I have been together for 9 years, had our ups and downs, planned becoming parents. But ever since baby is here everything went to hell. I feel so awful and guilty towards the baby as he is so tiny and his parents cannot keep their shit together! While I as a mum changed everything about my day to day life, husband changed shit much. He kept all his hobbies, goes around his days like a childless person, never worries about me, how I'm doing, how I'm feeling. He barely talks to me and spends his time on his phone. Every time I bring something up, it ends up with him saying I blame him for everything and that I am overreacting. Today he said I would be better off with him dead and I should leave him. It's like he got 0 sense of responsibility, 0 understanding and not a single bone in his body is empathetic. I have done everything right. I never forbade his hobbies, I gave him this wonderful child, I breastfeed day and night and got no breaks, I am sat at home alone all day every day looking after his child trying to occupy myself, making friends, planning activities. Yet every time I try to mention this isn't working and it is unfair, he twists it and I am left feeling like I am in the wrong. I honestly don't know what else is left here?? Baby is 11 weeks and things are just getting worse between us 😭