She wasn't in love with him though. She only recently-ish fell in love with him. What she had in her past life was envy and respect for his swords skills. The only thing that mattered to her in her past life was the sword. In contrast he did love her. To understand why he killed her you would have to read the story.
I mean you only read the prologue right? So you don't really know why she was so angry at him her entire life and why at the end she realized her life was kind of pointless. There isn't an excuse of why he killed her. He killed her and there was something that led to him making that choice, that only makes sense if you read the story. It isn't a simple knight story. There's a lot of magic, deities, and shit involved.
Her not seeking vengeance doesn't make sense to you because you don't understand the characters. No one that has read the story has complained about her not seeking vengeance. There's plenty of "I was reincarnated. I'm going to seek vengeance" stories. This isn't one of those.
She never calls him love until you reach beyond 200 chapters because she doesnt love him. She just respects him. And idk why you want her to want vengeance for. She was the general of a kindgom and he was the emperor and general of the enemy empire. They werent friends. He didn't ruin her life kr anything. They were both just doing their job. Yes, he did have a one sided crush on her (because he had actually met her before), but they were not on the same side of the war. So what's there for her to be bitter about? She had the choice in her life to choose either the kingdom or the empire and because she couldnt accept that someone was better at the sword than her she went for the kingdom. And now, after 20 or so years of fighting and the ML trying to convince her to join her, the fight finally ends and she decides she wants to do things different and not become the general of the kingdom. So I don't see your issue. But again, it's because you reviewed something you honestly have 0 idea about. It's weird. And it's weird that you would double down so much when again you didnt bother to read it.
Everyone chooses what stories to read based on first impressions. But people don't give their uninformed opinions as if they were facts saying stuff like "if you like stories about twisted love this is for you" (fyi this barely has any romance at 300 chapters ) when all they have is their first impressions to go off on. Otherwise there would be thousands of uniformed comments on all titles you see, giving you the wrong description of the series.
I understand if you don't like it based on the first several chapters, everyone has their own taste and if it's not for you, then ok.
But why are you stating your opinion as if you've read the whole thing?
Just like the previous comments said — no, she wasn't in love and not everything starts from romance. Sure, ML was in love, but there was a reason why he killed her and there was also a reason why she let him, fought him to the death, and chose to go to him when she went back in time.
This isn't "Abandoned Empress" where the FL just forgives ML because she fell in love and forgets everything that happened in the past.
If you're looking for revenge stories tho, then you're looking at the wrong manhuwa

This isn’t a spoiler, it’s the first prologue. I tried to read through, her own “love” killed her and instead of moving on and not being inlove. She still called him her love, if you like stories about twisted love this is for you.