In the movie, after Shane had said those words to Jon, the film ended. However, in the originaly screenplay, after Shane had said those words, Jon opened his mouth, wanting to say something as he was confused by Shane's words but he was unable to utter a sound. When Shane saw that, his playful character surfaced and he wrapped his arm around Jon's neck. The two then started frolicking with each other.
Jon: What are you doing? Let me go. (cough)
Shane: No I won't let go. Do you think you're the only one with secrets? Hm!
Jon could not overcome Shane's playful antics, so he simply laid his head on Shane's shoulder, not resisting, not moving. When Shane saw this, he did not reject. Instead he put his arm over Jon's shoulder so that Jon could lean his weight on Shane.
Both of them became quiet. With Shane's arm encircling over Jon's shoulder and Jon leaning against Shane, both of them watched the sunrise over the beach's horizon.