I left my violent husband. He didn't get jailed, but I did get an injunction, very hard in those days, and was I ever the villain! His family were furious with me, and then once he reckoned they'd softened me up, he came creeping back with all sorts of promises about how it would be different, he'd be a good husband, he wanted a chance to be a good dad etc etc.
I understand how tempting it can be. I was broke, on my own with my young son living in sub-standard accommodation and with as much self-esteem as a long-dead mackerel. Having him back looked weirdly like some kind of security. But I managed to keep hold of a tiny bit of self-preservation and told the police he'd broken the order. Cue rage, fury, threats from his family, and from him via them. This was a long time ago, and the support wasn't there in those days. I came so close... I do understand. But I managed to keep away.
It stopped evetually. I got some training and a job which helped my situation, I realised I could live independently, and I met a wonderful older man, married him and we were very happy. He died recently, but that doesn't take away the happiness we had. Ex-H remarried and has never shown any interest in our son, which shows how sincere he was then. Whetner he reamined violent I don't know.
There is a future without this man. You don't love him, not really, he has made you feel some kind of responsibility for him - he's manipulating you. There is a future worth having. It could be on your own with your children, it could be in a good relationship, it could be anything. Don't let this violent, dangerous and manipulative man take it away.