I want to see Liz and Jack together, but the true is that he was killed by her. She made her choice. She chose Will over Sparrow and decided to even kill her temptation for saving her true love. This make their relationship impossible. However she could have done it because of the growing feeling to Jack, so she tried to fight it and stay faithful to Will, but went too far. She didn't know that there would be a chance for saving him. I think that because of what Liz did to Jack she doesn't deserve a happy end with Will. 😉 I've heard (I don't know if it was written here )that the chains started and ended something between them. When Jack meets Liz he is chained and thanks to her he saves his life. In DMC he is chained once again and this time she kills him. That's why there's nothing between them in part 3. The producer should have made the second and third part different to let them love 😄