Way to make up your mind, dude!

Fans were shocked last night when Arie Luyendyk Jr. proposed to Becca K. before dramatically dumping her for runner-up Lauren B. just weeks later, but nobody was more surprised than his jilted former fiancee.

"The reality of it is that being with you, although it’s been everything that I wanted, I still think about her. And I think you sense that. I think for me, the more I hung out with you, the more I felt like I was losing the possibility of maybe reconciling things with Lauren," he told Becca while calling it off.

"We left Peru and I didn’t want to be as honest with you as I could have been about how conflicted I was. I thought that heartbreak would go away and it just never went away. And I don’t think it’s fair to be half in with you," he added.

Her reaction? "Are you f–king kidding me? I can’t even look at you. Just leave,” she told him.

Becca will come face-to-face with Arie for the first time on the After the Final Rose special tonight!