Explosive part 1 of 'The Bachelor' finale breaks all the rules

After Colton Underwood was rejected by his first choice Cassie Randolph who turned her back on the whole thing, the 27-year-old bachelor walked away and jumped the fence.
4:05 | 03/12/19

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Transcript for Explosive part 1 of 'The Bachelor' finale breaks all the rules
We are back with that bachelor bombshell. Part 1 of the explosive finale breaking all of the reality show rules last night. Colton was left alone sending both remaining women home without a proposal because he only had eyes for the one who left him and that would be cassie. We have all the drama this morning. ABC's Deborah Roberts is here. I have to bring it. I have to bring it. What can I say? Turning the show on its head. For the die-hard "The bachelor" fans sitting with their bowls of popcorn and red wine, it was a dramatic and unconventional finale. As you said a bachelor who broke all the rues in what appears to be a rare moment of reality on camera. 23 seasons of "The bachelor" and the script has flipped on reality TV. He just jumped the Fence. Reporter: Colton Underwood leaping over the fence threatening to walk off the show. Dude, I'm done with this. You want to be done with the whole thing. Yes. Done-done? Yeah. Reporter: Heartbroken after being left by the one woman he wanted to be with walking away from the other two finalists leaving Chris Harrison to say this overnight during the live finale show. Right now there are no more women in Colton's life. That's the first time in bachelor history that has happened. Reporter: Even the woman Colton was breaking off with breaking the usual rules of the franchise asking to talk away from the cameras. Can we talk without all these cameras? Yeah. Reporter: It doesn't usually go that way. This is how it usually happens. You join "The bachelor," eliminate contestants competing for your attention until you narrow it down to the final two. Then you pop the question to one of them and send the others home. Rarely does someone walk off the show. Though, this season saw several women eliminate themselves. And never before has the bachelor himself walked away from everyone who's left sending them all packing. It's over. All of this is over. I mean, I started this with 30 women and now there aren't any more people that I'm dating. Even past bachelor Jason mesnick who also threw out some of the rules in a final twist years ago breaking up with the woman he was engaged to and running after the runner-up tweeting last night, Colton, I hope you handle it better than I did. Colton's answer, I didn't. And so many viewers left with this scene, a sobbing bachelor pouring his heart out in an unexpectedly real moment. I just want to be loved back the way I love somebody. I don't know if that's possible. Reporter: And the mother of all bachelor cliffhangers. Knocking on this door, the big question for fans is Colton really going after the woman who walked off the show and broke his heart in the first place? What if the bottom line is she's just not that into you? Wow. That was a little cold. Well, the big question, you guys have to admit that, is reality TV actually having a real and honest moment? Well, fans of "The bachelor" are going to have to decide tonight. I can see, Paula, you were just waiting with bated breath. He went 0 for 3 willingly. You can't love three people at the same time. Unless you're on reality TV. There you go. Then you can, exactly. I want to see how this -- It is interesting he is actually -- he seems to be following his own heart in terms of what he's doing. Maybe he goes home with nobody. Tonight we find out who is on the other side of the door. It has to be cassie. And I know you were waiting. You can come over for popcorn and red wine. We do have an exclusive peek coming up Colton will be here live tomorrow. Will anyone be joining him? Cecilia? Hmm.

This transcript has been automatically generated and may not be 100% accurate.

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