Do guys ever happily move on and then return to their baby mama?

Contumacious
My ex and I were friends with benefits before I got pregnant. We moved in together and things were never perfect. We used to party together and once I got pregnant I completely changed my life. He continued to drink and get high all the time saying he would cut back once the baby came. I spent countless nights up crying till 3 am wondering when he would come home. He would always say he didn't hear his phone. The baby came and he cut back to 3 or 4 times a week. He would still stay out late and I'd be crying only know I had a baby too. He would say that I was sleeping so he didn't need to be home. Then we got I to a fight. He choked me. I called the cops. He got arrested. We were trying to fix things living apart. It would be good then bad then good then bad. I was concerned about a girl he worked with. Well sure enough as soon as we call it quits he's with her. He says she makes him happy. Is it possible for us to ever work things out? I know if we tried it would work. I feel like if it wasn't for this girl we would have worked it out. We are 27. His new girlfriend is 20! I'm so devastated. I want to fix things but he's just moved on so fast! Any hope stories?I feel like he is going to be just what I wanted for my family for her. She has a five year old who she doesn't see on the weekends. So I dunno. I'm sure people think I'm nuts for wanting him back. But I feel like it could be different.
Updates
+1 y
Also after we broke up I noticed something on his penis. Told him to go to the dr. Told the girlfriend I thought he had warts ( which he didn't tell her before sleeping with her because he was in denial) and turns out he has warts. So he didn't tell her, slept with her, and then found out he had them. She's still with him. I got tested and I'm negative for hpv and have no warts. It's amazing that she doesn't care that he put her at risk for an std without telling her.
Updates
+1 y
One more update... He changed my brakes about a week ago. Told me all these hope filled things like he hasn't given up on us as a family, who knows what the future holds, blah blah. We kissed and flirted. Then 2 days later said he didn't remember saying those things and we would never be together again. He has moved in and doesn't want me. Well why say those things? He wasn't trying to get laid. We just kissed. Could he be confused and just trying to make sure he doesn't miss something?
Do guys ever happily move on and then return to their baby mama?
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