Need advise on unexpected pregnancy, please?

I just found out that I am pregnant and told my boyfriend of six years. I figured that he would react poorly to the news but never expected him to ask me to get an abortion (we have both always been pro life). I told him that I would consider all our options before I made up my mind, I have decided that an abortion is out of the question and I will not be having one. When I told him he threatened to move out and said that he never loved me and some other not so nice things. At this point I really don't care if he sticks around, don't get me wrong I really need his support more than anything right now but he has started self-destructing. He stared drinking after I told him that I was keeping the baby regardless if he stayed with me or not, but It really got bad when I asked him if he wanted to attend my first ultrasound with me. I know that this was a shock to both of us and that he might take time to adjust to the news. I just don't know what to do...should I just leave him or should I say and hope that he supports me through my pregnancy.