Please help, I’m so lost

My partner is drug user (weed), he spends about $200 per week for just smoke. He has part time job, just about 25h pw. I’m on casual about 20h pw. We have 3 boys. I’m in charge of cooking and taking care of them. We don’t have the rules about that, but I think looking after the kids should be my responsibility because most of the time he stays at home, he plays game and smoke, otherwise watch Netflix. If the kids are at home with him, he would give them tablet if he uses xbox play game or xbox if he go outside for smoke.
Last Sunday was the worst, while he was playing game, baby accidentally turned off his Xbox and he started yelling and swearing at 1.5yo boy. Poor little boy freaked out and speechless. After I calmed baby down, he came to give a cuddle but in my tears, I pushed him away. I cannot believe who can swear at the baby just because the game was interrupted. Next day, he denied to take baby to childcare because I had pushed him away from us. In front of kids, he blamed me that I was f**king lazy as I didn’t hang the clothes which has been rewashed for 5 times. I was so tired after work and baby got sick, so I literally waited for him to hang that load of clothes. But no, every night, after being rewashed, he picked the kids uniform to hang for the school next day and left the rest. On Sunday afternoon, he went back from work and hang the clothes after I told him I decided to take it to the dryer, I don’t have energy to hang it. He kept swearing and telling to f**k off, he doesn’t want to live with a lazy person like me. I called the police, but the police came after he went to work and said they couldn’t help because it’s just a fight.
I still cannot drive and if I move out, I’m gonna be struggled with the baby and work because the public transportation is terrible at my city. So I have to stay.
I kept crying since that happened, I miss the old him, the one that I chose to be with, I miss us. I’m feeling lost and failed. What can I do?