Separating from partner

I am unhappy in my relationship with my kids dad.

I know that I would be happier single. We broke up before and I definitely was more at peace. I want to separate by the end of the year but I don’t know how to tell him. He’s probably going to get angry and yell and says mean things to me. He’s gonna say he doesn’t want me around the kids and say he’s gonna try to take the kids. We have 2 toddlers. I am going to be working again soon and I’ve been saving for a deposit so I can make it before the year ends. Idk how to tell him or my family I just hate how everyone is gonna look at me but I’m truly not happy and I don’t wish any bad on him just don’t want to be together.