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In the end, Whats his face finds Giselle. But it was stated before, they love only ONE person. Their whole life.
You may not have noticed it, but he's only killed people who he deemed rivals in love, or who upset Nathan. He's was doing it out of love.
So I think that ending was less him finding her and coming to kill her, but more finding his love after 11 years. Holding the hand of a child that looks just like him. And that smile on his face.
Keep in mind he had blood all over his lips, meaning that he had recently ate. Not to mention that the smile he wore, is the same one he wore in earlier chapters when being yandere for Lady Nathan.
So something tells me the ending was more like a Yandere "Found You~" type ending. Which idkkkk kinda turns me on, lul.