Should i walk away??????:/?

Everyone in my family absolutley loves my boyfriend. We both love eachother so much and mean the world to one and other...When we spend time alone we are inseparable. He has many many friends. I have very few friends..when it comes time to him hanging out with his friends i get extremley jealous, especially because alot of his friends are girls. We have been dating for about a year and 3 months. His best friend is a girl..although i really don't consider her his "best friend". She never would hangout with me and other people...NEVER. i always made him invite her to come hangout with us at night with a bunch of ppl but she would NEVER come..she only wanted to hangout alone with him...She's not a threat at all..she has a bf of her own and is not my bf's type at ALL..i just found it wierd that she would always tell him ALL her problems..EVERYTHING. when we first started dating she even use to call him crying all the time..anyways..i got fed up with this and about a week ago told my bf i don't want him hanging out alone with her and that it makes me feel uncomfortable...he said he understood...but now since she can't hangout alone with him she said she will never make an "attempt" to hangout with him when other ppl are around. It has caused all this drama...because she is constantly putting in his mind that i'm a first cl ***** and a horrible person and that he should break up with me...she tells everyone about what happened which has caused all of his friends to hate me...he also is left feeling guilty that he had to drop a friend like this....its just really frusturating we have been fighting alot over little things like this and NO MATTER who he hangs out with i get jealous..I just cant help it..dont know what to do anymore