don't wanna be with bd

I got pregnant on the pill, I'm 12 weeks and I don't wanna be with the father. All he wants is sex all the time, there's just numerous reasons that I don't have to say out loud, but I can't find a excuse to leave him... I've even reverted to saying I had a misscariage and moving away. 😞 soemone please help idk what to do!