Depression/confusion with db dad

Hi all, going to try to make this short as possible. My son was born 2018 and I have a second son 2023. Everything was fine, I was on and off with their dad since 2019 so maybe fine is pushing it but we coparented well until the second one. Once, I got in a relationship I feel like he didn’t want to support as much… at all. Even $10 in gas money. He doesn’t have a car since 2019 so I did all the driving them from place to place. He’s had women around the kids as well since forever I would imagine, started getting confirmation would my oldest would mention it. I couldn’t do anything though bc I work I need his care to go to work so I can keep a place so I dealt with it. In 2024, an actual month after I file for child support, his parents temporarily “kicked him out” allegedly. They did let him back at some point but that’s when he stopped watching our youngest. So I had to get my mom to, she works as well so it just seems impossible… 4 months later I did what no one should do…. I called him and we were “working on things together”. He dogs me whatever, I freak out, I’m taking care of kids alone & then you go to lengths to embarrass me, post things on social media etc. this whole time, he’s been clubbing. He stops speaking to me. Since may, Ive been blocked. He does video work, he’s found some female friends that get on social media and tag him in things as if he’s with his kids all the time… so anyway through child support there’s now a bench warrant out for him since last month. It’s October, our sons started school, so much happens you know in their lives in all this time, he’s never called to check. Just… left us like forgot us. His sister, since I started making social media posts in response, has checked to see them about once every two months now so in August they saw them and October. I felt compelled to the social media because he’s telling people I keep the kids from him… because I’m bitter over the females…which is another thing I have to fight through bc all I want is some help so I can do things for them. I called him blocked a week ago, asking was he still doing this why is he acting like he doesn’t care about his kids, his response was “I don’t care about anybody”. Last night is one of his friends birthday and I shouldn’t have but I did lurk out of curiosity and of course he was there front and center… clubbing. That’s the thing now. I hope someone can feel me, I have two young kids… I’m scraping by, he made one child support payment since June 2024… he doesn’t work. He’s content in his moms, no car, no place which he wasn’t like when I got pregnant… I don’t know what I’m asking maybe some support or just whatever positive you have to offer. These are my daily thoughts now since everything’s happening I know I need some therapy lol. I have been truly trying to shift my thinking, the kids and I had a great Halloween. They don’t ask about him anymore. Just wondering how you guys deal with that struggle of knowing, you could and should be splitting the responsibility when you’re taking all…. Thank you for reading