Three years after they first dated, Brody Jenner admits he's not sure if he still has feelings for Kristin Cavallari.

In a sneak preview of Tuesday's all-new episode of The Hills, Playboy playmate Jayde Nicole issues her 26-year-old boyfriend an ultimatum: It's me or her.

"I don't want to hook up with Kristin, but do I know if I have feelings for her? Not really," Jenner, who dated the former Lauguna Beach star, 22, in 2006, says. (Watch a clip above.)

"Why are we even sitting here talking if you don't know if you have feelings for another girl?" Jayde counters before walking away in tears. "You figure out what you want to do," she says. "If you want to be back together and you want to apologize, you can call me."