Why all the hate tho? Tbh, I find her character portrayal very realistic. Tiara's a human being capable of "feelings" (as a normal human would) and as such, is a complex character. While her attitude may not be the best, quoting and agreeing with
@Sanctuario,
it's not as if it wasn't justified.
In the first chapter, we were presented immediately with the story's conflict that is: Tiara realizing she's been reincarnated in a game as a villainess heading for ruin the very next day, by no less, her fiancé, the man who she is
in-love with, been with ever-since childhood. I agree the romance part wasn't expounded on, it's only briefly mentioned that being strict was how Tiara showed her love for Hartknights (plus he was her favorite character.) While Tiara understands that the game is different from real life, the plot still unfolds according to the game before her eyes. These very expositions affect Tiara's inner self like for example:
"I'm a villainess" = evil = not meant to be happy.
As the story progresses, you would see instances where she would question her role, is she just
a villainess? This plunged her into existential crisis (which could be explored deeper but it's not where the author is going.) Thus, betrayed by the one she loved, subjected to a very degrading condemnation (in front of a lot of people, the king, her father, etc.), coupled with the pressure of her knowledge of the game trapping her in a fate she wants no part of, and her current life as a high ranking noble expected to be queen to which she was restricted and educated (like what Aquasteed said about her in this chapter), all of those experiences she carries, it was only natural for her to develop all sorts anxieties and insecurities for her future even if she is, very much, adored by the crown prince of the neighboring kingdom.
Yes, she knows Aquasteed loves her very much but one of her conflict lies with having to lose Aquasteed,
slowly, as the plot of the sequel game progresses. She tried to fight fate as you see in this chapter when she asked Aquasteed to not personally see the inspection at Aishira's place. But then, the plot she dreaded still advanced Aishira's Aquasteed route. She's even aware that her recent actions are not proper but she can't help it, no one can help it. She's fighting something she can't see which makes her anxious, which makes her scared. She does not want this pre-determined fate shit to happen again but it
is happening, in her knowledge.
What she needs to work on is largely internal, to free herself from the notion that just because the sequel game's story progresses, doesn't mean Aquasteed and Aishira will be endgame. Obviously, as readers, we know this but Tiara's character does not realize this yet for the very factors that are stated above.
Implications are portrayed lightly in the story because it's a fluffy romance but if you delve deeply and place yourself Tiara's shoes, with all of her experiences, it's not to be taken lightly.
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As always, thank you for the frequent updates, Puni Translations!