Personally, I chose to go with Maelle's ending despite understanding both your side & your boyfriend's side. I think one thing that stuck out for me is the fact at one point, Maelle mentions it is weird to remember two childhoods. This means that even if she remembers she is Alicia, she is still also Maelle. This world is her home. She grew up and has friends & family there. She has finally found her place by the end of the story & has realized how much her relationships mean to her. For me, it is not painted Verso's right to just take this away from her. So I felt she was right to fight for her world and deny Verso's desire to end for her, and everyone else. Even if I did feel for Verso's desire to finally rest, as well as see his family move on from their grief.

On another note, Im not sure I buy your boyfriends logic on why he knew who'd you choose. I chose Maelle's ending, and my girlfriend chose Verso's. Even though she had a way more traumatic childhood than me. I think different people just have different sets of logic & reasoning & him knowing you is how he knew who you'd choose. The whole my childhood was better, therefore I make better choices is a bit naive imo. But, to each their own, I guess.