What a sad story but I have many things to wonder (SPOILER ALERT)

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Why does Dr Renald keep appearing, disappearing, and then reappearing throughout her life ? And when they could be together, he disapeared again and again ? And then he kept forgetting until he saw her again ? Does he has some kind of retrograde amnesia ?
It's like he's play hard to get. and Polyanna's character is true to her name, too stupid to even ask someone's name. They could've gotten together but I guess that it's life.
You never know what happens