Jack seems to admire Elizabeth. That underneath her noble upbringing lies a girl that is fond for adventure and has the metal to make it as a pirate. Jack had even teased her over this. This culminated in his decision to give his deciding vote to Elizabeth and make her the Pirate King at the Brethren Court. He held no grudge over her decision to leave him for dead to the Kraken, even admiring it and fondly referring to her as a pirate. When reunited in Davy Jones’ locker he seemed to not bear a grudge over his demise because of her, and instead nonchalantly revealed to everyone that she was the one that had killed him. Jack also seems to find Elizabeth very attractive, as during their first encounter he made her fasten his belt and put on his hat, enjoying the close proximity he was sharing with her. Elizabeth has had a positive impact on him. As although he can be selfish, her words of encouragement convinced him to face the Kraken that was hunting him down in order to save her and the rest of his crew and friends, as oppose to fleeing. Both of them had contemplated each other as partners, but reached the conclusion that it would never have worked between them. With Jack knowing full well that Will Turner was always her choice. here