What should I do??

Okay so all these girls planned against me to have me and my boyfriend break up and most of them were my friends. This one girl says she knows nothing about it but shes the one trying to tlk to him!!! All of them are saying he said we broke up and that he said he liked her but he denied it and I have trouble believing that he would do that because I know him and his values and they are everything against it. They smoke weed, drink, get arrested and everything else and he yells at me just for saying one cuss word!!! All of my friends are dissin me telling him behind my back to break up with me because the other girl is better and crap. I told her to step off but should I believe him??? And how can I make all of these girls leave me alone???