I need someone to hear me :c

Several people are not going to believe me and will even think that im crazy and that i need a psychologist.

Well... it all started, yesterday, (Monday). Some guy texted me (mi ex), at the start.. i didint wanna answer but he was disturbing so much.. eventualy i answer.. i didnt know it going to be the "end" for me.. at first he was normaly talking like he was wanting what happen with me with my life and that eventualy i felt insecure talking to him.. i was trying to end the conversation... then he started to say that he was the king of the demons, he was a demon, like a story he died en became the king of demons... im not sure if its ture or not... but then he started to say, "You was maked because your future is to be my bitch. The bitch of the king of demons" I was literaly scared I do have a bf and i say it to him but he just got mad and he started to say "I dont care if you have or not a bf, you are mine and no one can say something about it.." I was really friked out really. And now today he has threatened, he's going to kill my bf, my family and some other people if i dont do what he ask.. ¡LITERALY HE ASKED FOR SEX! WHY HE THINK IM GOING JUST ACCEPT?! Then he started to say that if i dont have sex with him.. he's going to kill my bf, or break some of his fingers... i dont want that... what should i do?... im really scared and freak out..

Someone please help me..