Feeling officially done how do I go about it

So I have been with my fiancé for 4 years and I feel officially done. We have two children together and it’s just not working. I don’t feel in love with him anymore and I feel like I have already emotionally detached myself from him. He ALWAYS threatens that he will get custody, but I am the mother and I am a good mom. I don’t drink or so drugs or anything I am sick of him manipulating me into staying. I don’t love him. We don’t sleep together he is constantly bitching at me for everything I do. He is always yelling or raising his voice and expects me to want to do everything he wants. I literally can’t stand this man anymore. How do I get out my family is 14hrs away and we just moved out here last year. How would you go about it. I have applied for jobs and am trying to find my own stability. I had a really good job and made really good money. I didn’t return after my maternity leave because we made enough on his income. Now I feel like he is trapping me. I don’t know what to do and I don’t want to get family involved because it makes everything much worse. I just want away from him I literally can’t handle him anymore. I don’t feel happy we hardly even talk he sits on his phone. He never helps out around the house. He uses I work everyday what do you do. Please anyone have any advice