yeah its like He's given up the pearl for her, long ago IMO, right from the start of DMC. He has everything he thought he wanted yet the pearl is no longer enough for him hence the fact his compass points to Liz
At the end He'll also give up her(who he now desires most) in order for her to be safe. I think he was gonna stay..and it pained him so much to let her go there..you see that long shot of him just staring at her then Gibb's line about abandoning ship..he looks pained (its short but you see it) he then walks in the opposite direction..then he looks really sad and depressed wern Liz comes in close proximity..
now that Kiss.. Itchanged something in both characters. It was essential to both characters' development..actually all 3 character are now changed after that kiss. Each is affected by it.
Jack's desire turned to love there IMO (compass doesnt show you what you love)
Liz's desire is still there..its actually magnified now because she gave into temptation and she's clearly still not had enough..she has all the potential to love him by movie 3.
Will's actions in movie 3 are now souly based on that kiss IMO
I can kinda see where the next thing is heading with Jack (guessing mostly)..and its not giving up her so she can be safe..its him giving up something else more major so that she can be safe...