I’m wondering if Belle will reevaluate Hook at some point, actually. She made a pretty severe judgement about his heart but generally has a good sense about people…but when she made that judgement he was pretty deep in his revenge-mode. And vengeance has been repeatedly shown to be the quickest way to a black heart in this show–it’s Regina’s desire for vengeance on Snow that makes her so evil, and Rumple’s warning seemed to be more about vengeance than the actual killing itself when Snow initially wanted to kill the queen.
If Belle and Bae both warmed up to Hook, that would be really hard on Rumple, since he already lost Milah to Hook and almost lost Belle to Hook (albeit in a different way). But it might also force him to see Hook as a person rather than an adversary. And it might help Hook to see Rumple as something other than the coward who murdered Milah.
There is such rich delicious potential for character development between the four of them. I hope at least some of it plays out.
Keeper of Belle's Gold magic, sand dollar, cloaks, purple FTL outfit, spell scroll, library key, copy of Romeo and Juliet, and cry-muffling pillow, Rumple's doll, overcoat, and strength, and The Timeline. My spreadsheet: https://drive.google.com/file/d/0B6r8CySCCWd9R0RUNm4xR3RhMEU/view?usp=sharing