He told her some of it, just not with the same degree of honesty. Some fans believe that once her heart was returned she was able to remember what happened at the well; I’m not so sure about that but he did tell her some of it.
[adrotate group="5"]
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