Starting over ?

Has anyone started all over? With literally nothing? Plus 2 toddlers and a 3 week old newborn? I'm panicking. While I was in the hospital my SO told me we had to be out a few days after we would be able to go back home. He lost his job during this covid mess and we got evicted for being behind on rent, he reassured me a million times that he had it figured out and everything was ok so I was never worried about it. After being in the hospital for 5 days we had to come back to my moms apartment. Its been stressful, I know he's stressed but he's been so mean. He doesn't play with our kids anymore, the only interactions they have are when he's yelling at them for something. We're both stressed but he makes it seem like I have no reason to be. This morning he said "fuck this" and started packing his bags, he said we we're done and he was leaving and not coming back. He's done this a thousand times before and once already since we've been here so I felt defeated and just said "go then" and from that he somehow came to the conclusion that I meant I was going to keep him from seeing the kids. He has a job lined up and we would've been fine soon, but now apparently we're done and he isnt coming back so I'm at a loss. Idk what to do, I planned on going back to school and working part time but now I dont know how I could do both and school was so important to me. He didnt say bye to the kids either and it really breaks my heart. Idk how you can do that to someone. I was here for him, I was trying my hardest to help him and make him happy because I know the situation we're in sucks and makes him feel bad. I guess my question was how did you do it? I cant stay here, I dont want my mom getting in trouble but I have no clue where to go or what to do.