Time off or time to go?

Recently i posted a question about my fiancé and our new room mate. Let me start off by saying thank you to all the ladies that gave their input. it really got my courage up and i spoke with him.. It seems that he doesn't see the problems and he will just tell me that thats enough. and he doesn't want to talk about it.. So i told him i wanted to go to my mothers for a few months if nothing changes about his room mate. But now theres a new problem.. he seems to get really angry and defensive when i speak about going to my moms. so i try to make a deal with him and work something out by asking him to take some time off from work so he can take care of me during my last weeks and help me out until i recuperate from the birth. But when i ask that he gets upset and goes off about his employment insurance not being enough and so on so forth. My mother is much too busy with my youngest siblings at home and dealing with divorce papers my father is too lazy to complete. So for her to come all the way to where we live ( 26 hour drive away ) is absolutely out of the question.. My fiancé's behavior has been insupportable lately cursing, getting upset or angry over simple things, using a very rude and annoyed tone of voice with me constantly and on top of that calling me names for no reason. Any ideas why hes behaving like this? Should i just leave for my mothers? or should i try to convince him to take time off from work? Thanks again ladies. Its so comforting reading all your advice! ( by the way we are a young couple. early twenties. So is his behavior something to expect at this time? i just feel like i have a lot of transition into the whole mother role and he hasn't moved an inch closer to the father perspective.