On paper he sounds really nice but he gives an uncomfortable vibe...like he’s crazy. And he’s nice to just tia not other people. It seems he’s a bit too obsessed w her honestly I feel as if he’d do something super manipulative to have just her by his side, depending only on him
In the beginning of the story, it was shown by Allen’s perspective that he was planning to marry Tia if she tossed away the prince, and for his own benefit (possibly the family’s too). Their social standing would be elevated a bit. Now, Allen really does “love” Tia, but it’s very possessive/ yandere-ish. And people see his change of mind very creepy. Me included. Although... I kinda enjoy seeing Allen like that sometimes.
Personally, I wish for Tia to not end up with anyone and just be a knight beside her father - though I know that's not the case.
However, I'm a bit confused why people are showing such distaste towards Allen all of a sudden. He was nothing but extremely kind towards Tia, and they had such a pure and great friendship with so much love, and still has that, obviously.
Anyone would question a "story" like that about time travel at first, but he came around and apologized so many times, and Tia has forgiven him, too. On top of it, he gets cut off by her father and can't do anything about it - that's bound to hurt a lot, and getting isolated like that without reasoning would make anyone bitter and angry.