User blog comment:FairyRaven/Fairy Tail Chapter 331: Natsu's Strategy, Review and Commentary/@comment-4643135-20130518034722/@comment-4829046-20130518045851

I see Milliana do a similar thing as Agnes in Familiar of Zero, never forgives that person, but doesn't kill him for the sake of the people who would be saddened by his death. Thus its just a compromise, they don't ever become friends again.