need some advice with my fiance 😓

so I'm 32 weeks pregnant. my partner is being a piece of work, though I know he's not a bad guy he's acting stupid and immature. hes always been a mummies boy so i expected some problems with him demanding attention. but he's biting at every comment and trying his hardest to start an argument at every turn. I'm high risk and he does nothing but stress me out I'm so worried about my babies health whilst he wants to put me on the back of his motorbike and speed down the motorway. I feel so trapped and alone because all he does is bully me slam doors and shout at me with sarcasm. then in public makes me out to be the bad guy and him the victim because I'm 'hormonal' I don't know what to do 😢