Cutting off ties can be hard, but staying can be harder.
Maybe make a plan for yourself, put some money aside for when the day comes and decide how you will leave...or make him leave. If you have family, please allow then to help, the time of separation can be a dangerous time, when physical abuse may enter the picture and you are pregnant so need to protect yourself and the baby.
Plan what you would do, put all the security in place that you can and then cut those ties or at least put enough space between you so that you can stay healthy and find your balance again, then decide your future plan.
My heart hurts for you, this should be a happy time but it doesn't look like it will be any time soon. You deserve better, so does your unborn child.
Good luck dear.