Advice?

I’ve been really sad lately. Things are getting really overwhelming. I have 3 kids 5,3, and I just had a newborn 2 months. My fiancé thinks that he should just be a provider. Just work and pay bills. And I have done everything so far with all my kids since they were newborns woke up every night, feedings, diapers changes, take to school, play, teach, anything they need. But with my new baby it’s really getting to me that he has been doing nothing with the kids and not helping me. He works a blue collar job so I understand it’s hard but, when he comes home he’s straight out with his friends almost every night and if not that he’s either on the phone with them, watching tik tok, or sleeping. Just completely ignoring the fact that he has me and kids I guess?? And last night I brought it up to him and he said I’m a grown woman and taking care of the kids is my job not his. And I shouldn’t be asking for help. Honestly I am in shock here a little bit. Any advice what I should do? Is this what most partners do that have jobs like that?