I think he does. He's had a few centuries to pick up on hints here and there, though I doubt she's told anyone directly. Noting that it especially pains her -- even if she doesn't show it -- when certain comments are made about the dwarfs, that sort of thing. He probably wouldn't bring it up, knowing that it'd only bring up painful memories for her.

The discussion of the OGN was very shippy; Charming wasn't very understanding about Snow's murdering streak, and Snow blames herself for the divorce in a way because, in a sense, she betrayed his trust by doing the killing behind his back. Had she married Bigby back then, he'd have known right away, given her more help with the lessons, and helped her cover her tracks. He'd understand that the reasons were something she would only discuss if she felt like it, and that revenge is something to be done personally.

Spending five centuries acting in a way that will most upset Snow -- Snow mostly being upset because she knew her sister could do better, and wanted the best for Rose? Geez. But yeah, she did improve at that point. It was great for the short time that they were working opposite each other -- Snow running Fabletown in the city, Rose in charge at the Farm. Sisters sharing what they had and all that.