idk what to do

im going to try and make this as least complicated as i possibly can. my boyfriend has a friend he know i dont like. hes rude, vulgar, annoying, smells VERY bad, has told me to grab the "back to school necklace" (kill myself), has encouraged my boyfriend to skip classes, full school days, and to leave me by pointing our "smashable girls". he knows i hate him and i honestly dont think im being unreasonable when i say i dont want him coming over. when he is I get so sick that i throw up, cant eat or drink, and my stomach hurts terribly. but he still has him over time and time again. i love him but i feel like he wants to hurt me at this point. its either me or him. is that wrong of me for making him choose? EDIT- I also want to add that this friend of his wants to be friends with me. even after all that hes done to me.