You'll understand it if you think of it this way
Reader wants MC x Oshi
But MC disagrees because she like Saint x Oshi better
That's why MC doesn't want to acknowledge Oshi's interest on MC because
MC likes Saint x Oshi
I get all that but what kinda makes me mad is that Aria knows that the saint loves Onyx and wants to be with him so why force a ship that doesn’t want to be together? It would just make everyone unhappy
If you're pertaining about her more earlier shipping in the story, its the parasocial shipping
You can especially see the parasocial shipping when the Saint said she'd fight MC for Onyx's love/attention
And parasocial shippers tend to not think of the people involved in the ship (their feelings, relationship status, friendship, boundaries etc.)
plus she didn't even acknowledge them as people but rather as characters in game with already set unchanging charactereristic,dialogues, scenes, and preference
Before you read this
The FL is basically a parasocial shipper
I'm surprised that alot of people hasn't even realised it from the beginning (literally when her oshi saw her at the start, the moment she ran away instead of seeing that as an opportunity to romance her oshi //even if she knew how to save him,romance him, and everything// she still chose to ran away is the moment I know that she's that kind of fan)
So all logics and reasons are warped to fit extreme oshi fans, so stop now if you dont understand the hardcore shipping cause the FL is like a horse on a race track only seeing what's infront and that is her ship and her oshi (for the most part of the beginning)
//Mild Spoiler
The plot did take a turn when she found out about the truth of the world and we start seeing that she starts to consider other variables in the world people, experiences, etc. That's when we get to see more of their nature not following what the FL's thoughts of the whole thing