He’s probably ashamed of some of what he got up to in his depression after losing her. Neal promised he’d see them again; Hook only vowed he’d think of her every day.
If he gave up hope of getting back to her, he might have done some awful things. We know he’s capable of it. He’s cuddly…but we’ve also seen him kill people and torture people (if less so than our queen and imp).
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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