I almost think this is a moot point. It played out one of two ways
1) Regina had JUST married the King, pushed Cora through the mirror, tried to leave and then changed her mind and returned
2) She had NOT married the King, pushed Cora through the mirror, married the King, tried to leave and then changed her mind.
Frankly, one sounds less complicated but at any rate, she chose to stay with Leopold and learn magic when she’s claimed all along that she just wanted freedom.
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"He was a lot of things to me" "The only conclusion was love"