How we cite our quotes: All quotations are from Titanic.
Quote #1
JACK: You don't want to do this.
Jack and Rose meet when Rose is contemplating throwing herself off the back of the Titanic. Jack's not convinced that Rose genuinely wants to die, and manages to get her to calm down/try to get back over the rail.
Quote #2
JACK: Listen to me, I've got you. I won't let go. Now pull yourself up, come on!
"Not letting go" is a big theme in the movie—you'll see that phrase come up again and again. In this first instance, Jack is trying to get Rose back over the railing…but she slips. Luckily for Rose, Jack remains very committed to keeping Rose alive throughout the movie.
Quote #3
JACK: No, no, that's not what I was thinking. What I was thinking was, "What could have happened to this girl to make her think she had no way out?"
When Jack and Rose talk later, Rose is worried that Jack thinks badly of her, given that she's clearly so privileged and, yet, was trying to kill herself. Jack explains he's not the judgmental type—really, he was just interested in knowing why she was so distraught.