How to make it financially????

Allie • Mom of 2

My boyfriend and I have been together 5 yrs. and have 2 kids together. We have had a lot of problems with him being jealous and controlling over me when I have never been unfaithful but I have cause him talking to other girls on Facebook etc. long story short I got fed up and decided I was gonna leave. I packed mine and my kids bags and he broke down and cried and begged me not to leave told me our family was the best thing that's ever happened to him and he would do whatever so I wouldn't leave. So I told him to go to counseling for his jealous and trust issues and to stop with the other chicks. He was really good for about 3 weeks. But he is not going to counseling anymore not taking his mess. And he hasn't been jealous or controlling since I said I was gonna leave but I know it's coming. So I have decided I'm really done and want to leave. But he make more than I do and we live pay check to pay check as it is. I have to pay a babysitter ( my parents live to far away to watch them) and I don't trust his mother ( long story). But at leave half my pay goes to babysitting. And the other half rent and bills. I worry if I leave I won't be able to provide for my kids. And if I push child support he won't have money to support them when he has them. But I don't want this to be the only reason I stay with him. So any advise???