Her motivation was clear in 2×5: to bring back the stable boy to life. From a storytelling perspective, it makes sence sequentially first to have Regina consider moving on with someone else only for her to go running back to a dead corpse. Very Regina.
This is very true. 303 is a reminder that she lost Daniel and 205 shows the consequences of that: she’s more determined than ever to figure out if Rumple (or anyone) can bring him back.
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"He was a lot of things to me" "The only conclusion was love"