Why is it their business

Id like to know something.....Why is it when you are going through a divorce your children, and your family and friends feel like it is their business to tell everyone your business. I get so pissed off to find out someone has told someone my business. My older kids telling their friends how they are sick of the drama (which.... they had a hand of starting) By going behind my back to the stbx.(do they not think that would make me mad?) Everyone sticking their nose in it then bitching about it being drama. It wouldn't be drama if everyone would stay out of it. How do you get them to back the hell away and stay out off it. I've told them politely and that doesn't work. I've tried to be understanding to there feelings. But it aggravates me to no end to hear or know they have told someone they hate being at my house and around all of this. Did I ask them to come..NO......Why did they come?.... To give me support.....huh....Any idea's on how to fix this? Believe me I'm ready for it to stop....