Poor Katy... It didn't work out with Russell, John, and now Diplo.. 

Here's what we found out from an insider

"Diplo broke up with her because she does not want to be in a serious relationship. She's doing OK and not too sad about it. They wanted different things. She doesn't want to get married again — at least not anytime soon. She wants to date and he wanted something much more serious. It was too much, too soon."