@Sylvacoer it's just the culture of Belgoat, it was sorta explained earlier that it was a part of the culture but we don't really know what lead to that, just that they don't use names unless they're very close
I don't get it she is dying, he likes her. Marry her and enjoy the best life with her and after a few years she will live a perfectly healthy life. Maybe it's cause he fears for her safety? The way I see it's just a cruel self punching mundanity