Trapped & Pregnant

I feel completely trapped in my relationship, I am 22 weeks pregnant with someone that can not do anything for me, and the only thing that is holding me back from kicking him out of my house is the fact that we can take turns taking care of my baby while I finish my last year of college next year. I just need assistance on child care, and I will be fine on my own. I don't want to move back home I want to stay here. And not having him here will resort to that. I just feel stuck. So pretty much he is my way of not moving back home. I just don't know what to do.