I wonder if this reincarnator doesn't think this reality is quite real, or actually care about the feelings of the scores of young women she has stolen the fiancés of.
Unfortunately, I'd say no. It's a common, but unfortunate way the human brain works, especially when it's faced with a huge paradigm shift. Humans have a tendency to double down on a mindset or plan when they're under stress.
Imagine being a person who's only known these people as fictional characters. They are programs on a fixed algorithm, a simplified simulacrum of a social interaction, with a pretty face and a nice voice. You know that as long as you say ABC, do 123, and gift them XYZ, they will smile at you, say they love you, give up everything to you or to be with you. If you solve the puzzle of this simulation, you win the game and you become their everything. Everything is straightforward, a story, a fairytale romance.
Now imagine having to suddenly come to terms that those simple flowchart interactions have the possibility of humanity. Imagine that saying ABC and doing 123 and gifting XYZ isn't enough to 100% guarantee you become someone or someones' everything. Suddenly these characters are suddenly people with lives outside of you, that if you slip there isn't a load game button, that you have to apply the social norms of their world, not yours, to every person you interact with. Suddenly your simple, straightforward formula in your dream-like, fairy tale game has loose ends and plot holes and responsibilities the game never told you about and you never thought of. Suddenly you need to treat your game as real life.
Most people would cling to the familiar, focus on only the things they do know, and maybe convince themselves that the life they're finding themselves in will follow the game and everything will work out without you needing to do anything else outside of what you had to do. The game is always written on the side of the heroine, so she usually has an advantage somehow. The reincarnator in Liliana is probably doing that even if it's never addressed; to her she is still thinking in game rules. If she's someone who played the games for either emotional/wish fulfillment or escape, doubly so.
God i still feel awful for parfait. Poor girl must be absolutely crushed.
I do too, but on the other hand I kind of want to encourage her to let go of him and find herself someone better. All Parfait and Gainas have is their childhood affection and certainly, he's at least respecting that and wanting to find a way to let her down as gently as possible. But he's also willing to discard and reject the feelings of a woman who loves him as much as he loves another woman who he has to share with several others, and the woman he loves likely doesn't even love him for the fraction of the affection he has for her. IMO, Parfait deserves better, I hope some other better noble guy becomes friends with her and sees her for the lovely girl she is and loves her so much and makes her so happy and free that Gainas will regret letting her go.