Who cares if they talk. Next week they will be doing the same about someone else in the group. I don't want to take away from your feelings but really, it is not quite the life ending situation you are imagining
So your choices
1- find a new circle
2- tell your crush you like someone else; so they think your not interested
3- meet Someone else, so they know your not interested
4- start a small rumour to redirect the Chinese whispers
5- stop caring. I wish more people liked me- when in the entire existence of anyone have thu ever said " I wish everyone would stop liking me?"
Face it, it's an ego boost for them. (Just saying)