It's the episode fans of "The Bachelor" have been waiting for! Colton Underwood will finally jump the fence on Monday night's episode.

Three women remain in the fight to win his heart, and this week's episode is expected to be as dramatic as ever.

In this sneak peek, fans receive a clue as to why Underwood breaks down and does the infamous fence jump that fans have been anticipating all season.

Cassie's father travels to Portugal to surprise her and have a serious conversation about her doubts about Colton.

"It's great to see my daughter, but I came here because I have a concern with the potential engagement that might be around the corner," Cassie's father says in the clip.

"When I saw Cassie at our house last week, I can't say that I was convinced that she was in love, so I want to make sure that she's seeing with both eyes open," he adds.

In an emotional exchange, the father and daughter discussed her feelings regarding Colton's potential proposal.

When her father suggests that she might be conflicted, Cassie responds, "I wish I could just have more time. I don't want it to be over with him, but then it scares me getting to the end and accepting a proposal."

"There shouldn't be any hesitation in your mind when you meet somebody that you want to spend the rest of your life with," her father responds. "If you're not feeling it, the longer you let it go on is not doing you any service, not doing him any service."

"You just need to be honest with yourself and with him," he adds. "Don't hesitate to follow where your heart is."

Could this be what sends Underwood over the edge?

In an interview with "Good Morning America," Chris Harrison spoke about the highly anticipated fence jump.

"I will reveal this: One, he was not happy. Two, I was about 10 yards behind trying to get him to stop and have a conversation. Three, he clearly didn't want to have that conversation to the point he was willing to launch himself over that wall," he shared.

Check out the clip above and an all-new episode of "The Bachelor" tonight at 8 p.m. on ABC.

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