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I think the problem is we're thinking about this as if Regina has all the information that we do. While I do agree it's wrong for her to blame Snow, from her point of view she didn't even know Snow had told her mother until she went up to her while she was trying on the dress. At that point all Snow told her was that she told her mother. Nothing about the conversation Cora lead her into and twisting her emotions to make her talk. To Regina that looks like right after she makes her promise to keep it a secret she goes right off to tell. So in her mind Snow did betray her.
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