Originally Posted by 
Cat1864
				
			 
			It sounds like you already have Facebook drama (sounds like a TLC channel program :) ). 
If you feel you have to say something, how about: I value our friendship, however, I don't feel that being friends on Facebook would be appropriate for right now. Please do not send another request. I will send one to you when I think it won't be seen as encouraging more drama.
I wouldn't ask the friend to tell the ex anything. That puts her more in the middle and would end up causing more drama.