It actually makes a lot of sense how it's written in the LN version. For one she isn't portrayed as a raving bitch in this version. Basically it's the same events, with a different Aria. The initial conflict with the hero beating up Wazu turns off Aria forever. (As it fucking should, he and Aria were in love and had years of history together at that point, already the LN makes more sense then the WN.)
She follows the hero out of duty and basically confirms he is as much a piece of shit as she thought, him being your standard bully womanizer subversion of the hero trope. The "kiss" that Wazu witnesses never happens, and it was the Hero trying to trap Aria in an engagement. That becomes the final straw and she basically has her own adventure ducking the church, kingdom, and the asshole hero all while growing in strength and friendships in order to track down Wazu and fulfill their promise to marry. (Which they do)
It's actually a sweet story, and could probably stand on it's own as it's own novels if fleshed out. People say there's more character growth for Wazu in the WN version, but all he does is beat up a bully and flexes on his ex with his harem. In the light novel Wazu still learns to have confidence and face conflict head on without having to sacrifice Aria's character, and even goes so far as making her a protagonist in her own story. LN version is in my opinion superior.
...and hopefully someone translates it.