ali-fed-roberto-split.jpgAli Fedotowsky and fiance Roberto Martinez have called it quits!

"Ali Fedotowsky and Roberto Martinez have ended their relationship. As they go through this difficult time, we ask that you respect the couples privacy," their rep said in a statement.

Martinez proposed to Fedotowsky during the 2009 season finale of The Bachelorette, and their engagement lasted a year and a half. Though Fedotowsky blamed their wedding postponements on scheduling conflicts, a source recently told Us Weekly, "Their relationship has been tumultuous since day one. They're either extremely happy or they can't stand each other." Another source told the mag, "They bring out the worst in each other. She's miserable in the relationship and he is too."