Audrina Got Left Out

Lauren Conrad and Audrina had a small falling out. Conrad’s best friend from high school, Lo Bosworth, moved in with Conrad to the house at front, and spent most of her time with her. Conrad and Patridge had a cry out session where Patridge told Conrad that she felt like she was being pushed away. And she was!
Source: https://www.huffingtonpost.com/entry/lauren-conrad-explains-the-culprit-behind-her-iconic-crying-scene-on-the-hills_us_579b92d3e4b08a8e8b5ded68