What should i do about me ,my bf and and this jealous relationship ruiner ?

okaay so me and my best friend are like bffl but now this girl called jess came into our friendship which was okay with me but jess has always been jealous of me and my bf e.g we were having a sleepover and she went in a mood with both of us for he rest of the day , and yesterday me and my bf wanted to practice our instruments in a music room and jess wanted to come ( she dosnt even have an instrument !!! ) and i said to my bf that i wanted to concentrate ( if you met jess you would have a headache in seconds ) anyway she heard and started having a go at me swearing and all that so basically we got into a fight and now i dont want to talk to her she wants to be friends but i dont anymore because ive never really liked her ive only put up with her because my bf likes her but now she just seems like a horrible person and now everyones nagging me to make up with her should i have to ???p.s she has ruined my relationships with boys and bf's before.... help?!?!? *best answer 10 points * xxx