miserable

I love my kids to death but I hate their dad. I love him but I'm so miserable in this marriage. I've tried to leave him but we ended up back together and now I'm pregnant with our 3rd child. I was about to leave and stay gone for good. I just don't know what to do now. I feel stuck. I've been a stay at home mom for almost 5 years. I've only had one job before and that wasn't even a year. He's lied to me, cheated on me, and is mentally abusive. I just don't know what to so anymore. any advice would be great.