Review Detail of nacht in The White Titan (ONE PIECE TO FAIRY TAIL WORLD)

mc personality is trash, in fairy tail world he save girl name kagura who lost all her family because they all get killed and after that she sees the mc as her family but the mc basically throw her away like trash. idk why mc do that he should have know what it felt to lose a family, in first world one piece he loses his first and second family, i understand he doesn't like want to lose family again but to kagura perspective is like her family betrayed her and add salt to injury he show much more care to the other people who in her perspective is not a family and more like he just know other people name or aquintance. or my assumption is all wrong and author is basically unable write loving family relationship and can only write a tragedy