Kendall Jenner had been dating boyfriend, Julian Brooks. But now, the Agua Bendita bikini model split with the University of Nevada football player. 

According to a new Star Magazine report, the "Keeping Up With the Kardashians" star, 17, is heartbroken because Brooks, 19, was reportedly cheating.

Hollywood Life believes that the report suggests Kylie Jenner's older sister had an "explosive" breakup with Brooks. Jenner is heartbroken over the split and having found out that her high school sweetheart was reportedly unfaithful.

"He would disappear for days and not answer Kendall's text messages," sources told Star. 

The cheating speculation became too much for the teen to handle, so she decided to end her nearly two-year relationship with the college athlete.

"[Kendall] couldn't live with the doubt," the source continued.

Kris Jenner's daughter started dating her Sierra Canyon School friend in May 2012. The twosome even went public with their romance again over the Fourth of July weekend, taking some viral pictures.

For a long time, it seemed like couple were inseparable. Brooks, who stands at 6'3" over the 5'10" Jenner, has a "Brooks" beanie line that the model loves and has wore in Instagram photos.

Rob, Kim, Khloe and Kourtney Kardashian's younger sister will have her siblings' support to get through the break up, HL reported.

Upset that Jenner and Brooks aren't together anymore? Let us know in the comments section below!