Ok, this is what I think when Regina told Rumble that she had a mermaid problem that is because when Regina tried to kill Snow again Snow must have been in the boat or by water and Regina tried to drown Snow. Ariel comes to Snow’s rescue and saves Snow. Or since Regina is Ursula, Ursula tried to drown Snow in her boat and the Mermaid (Ariel) saves Snow from Ursula
Given the past few photos I am starting to think that Snow and Ariel know each other, though I haven’t worked out how. It makes sense for Snow to know the other Princesses.
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"He was a lot of things to me" "The only conclusion was love"