Poor Kristin! Our hearts go out to her during this troubling time.
Us Magazine Reports:

After a three-month engagement, Kristin Cavallari is back on the market.

The former MTV reality star, 24, is no longer engaged to Chicago Bears player Jay Cutler, 28, multiple sources confirm to Us Weekly. The two announced their engagement in April after just eight months of courtship.
(Cutler confirmed the split himself early Monday via his Facebook page: “Thank you all for the support, but if you talk bad about Kristin I will delete and block you,” he wrote. The athlete also changed his profile picture from one of him and Cavallari to one of him and his sister, Jenna.)

According to one insider, Cavallari — who rose to fame on Laguna Beach and The Hills — was “blindsided” by the split. “Jay dumped her out of nowhere.”