You do realise that HE'S the reason she had to suffer countless painful deaths just because he thought she was the reason for his loneliness. Girl didn't even know anything not has control over the system yet Vidar blamed her anyways and made her suffer. Now that our girl has finally found someone who actually loves her and respects her, Vidar goes like "she was mine first" like do you even hear what you're saying bro?
I also understand the concept of a route in an otome game!
So he didn t cause her her suffering, he always respond the same way (ignoring her because of his own feelings) so she experiences the other ml routes and those Ml made her suffert, until we reach his route and he get his change of heart.
You know if the other Ml weren t dangerous bas**rds she wouldn t had suffert? People have that weird tendancy of blaming 1 character for everything but the only thing you could blame him from his "ignoring her" and let give him that, in his route he is the one letting an "outsider" getting the role to protect her from the other Ml but of course you wouldn t see that.. easier saying he is to blame for everything "being trap in a game with multi route" included...
Also, you do realise that SHE'S the reason why HE became all twisted and the true monster she designed him to be, right? That's from the newest chapter. If what he says is true and she's somehow the creator of this world... then that will change everything on how the characters should be viewed, especially Vidar since he's the one who lived alone and suffered for thousands of years because of her.

I know it wont happen you dont change first ml just like that but I wish she would end up with V/Bidar!!