I think you should talk to them all.
First, your boyfriend. You need to tell him that you still want to be his girlfriend, and that all the rumors are false. Explain to him that your friends are trying to brake you guys up, and that you don't want that to happen.
Then, your friends. Tell them to leave the two of you alone. Tell them that you love each other and that's the way it is. And if that doesn't work, tell someone. Someone's got to know what to do.
Good luck. Hope the two of you stay together.