stuck in a relationship

This is probably more of a rant but any advice is welcomed, me and my fiancé have been together for 3 years since we were 17 and now we are 20. We only knew each other for 1 month before he moved into my house with me and my mum and we started dating.

I don’t have feelings for him and i haven’t for a while in all honesty i hate anything intimate with him and i am mentally checked out of the relationship. I know everyone would be thinking just to leave him but i stuck in a bad situation.

He has violent tendencies and outburst, he can say super nasty things and he threatens violence when he’s angry and will do more petty things such as push me/throw something/poke me to get me to retaliate so he can use it as a excuse to become more physical

with all this being said my mum absolutely loves him - we broke up briefly last year and my mum was basically forcing me not to kick him out etc and he obviously was super angry during that first attempt to break up that i gave in and we stayed together.

I just feel so stuck and isolated it’s like i have no way to escape and since he lives at my house i can’t just up and go. I feel like im going to be stuck in this relationship forever.